CN215265239U - Series-parallel circuit black box reveal teaching instrument - Google Patents
Series-parallel circuit black box reveal teaching instrument Download PDFInfo
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- CN215265239U CN215265239U CN202121176547.9U CN202121176547U CN215265239U CN 215265239 U CN215265239 U CN 215265239U CN 202121176547 U CN202121176547 U CN 202121176547U CN 215265239 U CN215265239 U CN 215265239U
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Abstract
A series-parallel circuit black box disclosure demonstrator comprises a box body, wherein a series circuit box, a parallel circuit box, a first power box, a second power box, a voltmeter and an ammeter which are independent respectively are arranged in the box body, the series circuit box, the parallel circuit box, the first power box and the second power box are respectively provided with a box cover capable of being opened, a series circuit is arranged in the series circuit box and connects two lamps in series, a parallel circuit is arranged in the parallel circuit box and connects the two lamps in parallel, exposed binding posts are respectively arranged on two sides of each lamp, lead-out wires for connecting a power supply are respectively arranged outside the series circuit and the parallel circuit, direct-current power supplies are respectively arranged in the first power box and the second power box, the voltage of the first power box is greater than that of the second power box, and positive and negative connecting wires of the power supplies of the first power box and the second power box are led out from the box; also included are connecting wires for detecting voltage or current, and making short circuits.
Description
Technical Field
The utility model relates to a teaching instrument technical field, in particular to demonstration appearance is revealed secretly to series, parallel circuit black box.
Background
The knowledge of series and parallel circuits in the nine-year-class physics is the basis for exploring circuits in the electricity, and is a key knowledge point for understanding and applying circuit rules and identifying and designing the circuits. In the total review of the middle school entrance examination, no matter the reappearance of the knowledge points is consolidated, the test question training is performed, even the redo experiment is performed, the students can feel that the repeated review is performed, the learning interest of the students is gradually reduced in the repeated learning process, and therefore the overall review effect is influenced. Moreover, the line connection and the working principle of the series-parallel circuit are boring for beginners to explain knowledge and are difficult to understand. At present, no black box teaching aid related to series and parallel circuits is available on the market, so that an experimental teaching aid capable of exciting the learning interest of students, training the practical ability and the mental analysis reasoning ability of the students is needed in the circuit teaching process, and the students are more interested in physics.
Disclosure of Invention
The utility model aims at prior art not enough, provide a demonstration appearance is taken off secretly to series circuit, parallel circuit black box, it is through setting up series circuit, parallel circuit black box and power black box, can take off secretly the verification to series circuit case, parallel circuit case through a plurality of experimental methods, reaches the ability of training student's manual operation and brain-based analysis reasoning.
The technical scheme of the utility model is that: a series-parallel circuit black box disclosure demonstrator comprises a box body, wherein a series circuit box, a parallel circuit box, a first power box, a second power box, a voltmeter and an ammeter which are respectively independent are arranged in the box body, the series circuit box, the parallel circuit box, the first power box and the second power box are respectively provided with a box cover which can be opened, two electric lamps are respectively and fixedly arranged on the box covers of the series circuit box and the parallel circuit box, wherein the series circuit is arranged in the series circuit box and connects the two electric lamps in series, the parallel circuit is arranged in the parallel circuit box and connects the two electric lamps in parallel, exposed binding posts are respectively arranged on two sides of each electric lamp, lead-out wires for connecting a power supply are respectively arranged outside the series circuit and the parallel circuit, a direct current power supply is respectively arranged in the first power box and the second power box, and the voltage of the first power box is greater than the voltage of the second power box, the power supply positive and negative connecting wires of the first power supply box and the second power supply box are led out from the boxes; also included are connecting wires for detecting voltage or current, and making short circuits.
The series circuit box comprises a first series circuit box and a second series circuit box, exposed binding posts of two electric lamps on the first series circuit box are arranged on the same straight line extension line, and exposed binding posts of two electric lamps on the second series circuit box are respectively arranged on two straight lines.
The parallel circuit box comprises a first parallel circuit box and a second parallel circuit box, exposed binding posts of the two electric lamps on the first parallel circuit box are arranged on the same straight line, and exposed binding posts of the two electric lamps on the second parallel circuit box are respectively arranged on the two straight lines.
The voltage of the first power box is 4.5V, and the voltage of the second power box is 3V.
A box cover is hinged and fixed on the box body.
And protective foam is arranged on the box cover.
The internal symmetry of box is equipped with two first mounting grooves, series circuit case, parallel circuit case, first power supply box, second power supply box are located two first mounting grooves respectively, set up the second mounting groove that is used for placing voltmeter, ampere meter, connecting wire between two first mounting grooves.
The box covers of the series circuit box, the parallel circuit box, the first power box and the second power box are fixed in a hinged mode or are respectively connected with the box bodies through magnets.
Magnets are arranged at the bottom of the cavity of the box body and at the bottoms of the series circuit box, the parallel circuit box, the first power box and the second power box respectively, and the series circuit box, the parallel circuit box, the first power box and the second power box are fixed in the box body through the magnets.
Adopt above-mentioned technical scheme: the box body is internally provided with a series circuit box, a parallel circuit box, a first power box, a second power box, a voltmeter and an ammeter which are respectively independent, the series circuit is arranged in the series circuit box to connect two lamps in series, the parallel circuit is arranged in the parallel circuit box to connect the two lamps in parallel, and each lamp is respectively and fixedly arranged on the box cover, namely, only the lamp and a binding post outside the box can be seen, and the series circuit or the parallel circuit in the box needs to be verified through experiments. When the power supply device is used, the same power supply method can be adopted to train students to infer the relationship between the total resistance of the series circuit and the total resistance of the parallel circuit, so that the series circuit box and the parallel circuit box are distinguished, the students can intuitively feel the difference between the series circuit and the parallel circuit, and the understanding of the students on the series principle and the parallel principle is deepened; students can also learn the use methods of the ammeter and the voltmeter; meanwhile, the voltage of the first power box and the voltage of the second power box can be verified by comparing the brightness of the lamp of one circuit box under the power supply of different power boxes, so that students can more intuitively understand the voltages. In addition, by adopting the black box reveal teaching instrument, the circuit types in each circuit box can be verified by a plurality of modes such as a circuit breaking method, a short circuit method and the like, the curiosity and enthusiasm of students for circuit learning are fully mobilized, the learning interest of the students is stimulated, and the black box reveal teaching instrument is simple and standard in manufacture, easy to operate in experiments and remarkable in experimental teaching effect.
The invention is further described with reference to the drawings and the specific embodiments.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of the circuit connection in the first serial circuit box according to the present invention;
fig. 3 is a schematic diagram of the circuit connection in the second series circuit box according to the present invention;
fig. 4 is a schematic diagram of the circuit connection in the first parallel circuit box according to the present invention;
fig. 5 is a schematic diagram of the circuit connection in the second parallel circuit box according to the present invention;
fig. 6 is a schematic diagram of the circuit connection in the first power box of the present invention;
fig. 7 is a schematic diagram of the circuit connection in the second power box of the present invention.
Detailed Description
Referring to fig. 1 to 7, a series and parallel circuit black box reveal and reveal teaching instrument comprises a box body 1, wherein a series circuit box, a parallel circuit box, a first power box 2, a second power box 3, a voltmeter 4 and an ammeter 5 which are respectively independent are arranged in the box body 1. The symmetry is equipped with two first mounting grooves 11 in the box, series circuit case, parallel circuit case, first power supply box 2, second power supply box 3 are located first mounting groove 11 respectively, set up the second mounting groove 12 that is used for placing voltmeter 4, ampere meter 5, connecting wire between two first mounting grooves 11, make the range in the box 1 compacter. The series circuit box, the parallel circuit box, the first power box 2 and the second power box 3 are all provided with openable box covers and can be made of opaque plastics, and the specific connection structure of the circuit box and the power box is hidden in the box, so that students can perform experiments under the condition that the circuit connection in the box is not clear, and meanwhile, the waterproof effect can be achieved, the weight is light, and the use is light and convenient. The box covers of the series circuit box, the parallel circuit box, the first power box 2 and the second power box 3 are fixed in a hinged mode or connected with the box body through magnets, and after an experiment is completed, the box covers can be opened to verify whether the judgment is accurate. The bottom in the cavity of the box body 1 and the bottoms of the series circuit box, the parallel circuit box, the first power box 2 and the second power box 3 are respectively provided with a magnet, the series circuit box, the parallel circuit box, the first power box 2 and the second power box 3 are fixed in the box body 1 through the magnets, the series circuit box, the parallel circuit box, the first power box 2 and the second power box 3 can be placed in the box body 1 in order, and the magnets are adopted for fixation, so that the magnets are convenient to move in the experimental process. The series circuit box and the parallel circuit box are respectively and fixedly provided with two electric lamps on box covers, the electric lamps are small bulbs with the same specification and the same rated voltage of 2.5V, the series circuit is arranged in the series circuit box to serially connect the two electric lamps, the parallel circuit is arranged in the parallel circuit box to parallelly connect the two electric lamps, exposed binding posts are arranged on two sides of each electric lamp respectively, so that students can deepen understanding of the serial and parallel principles through experiments, short circuits can be made on a certain electric lamp through connecting wires by utilizing the binding posts, and a voltmeter 4 can be conveniently connected at two ends of the electric lamp in parallel for measuring the voltage on the electric lamp. The external parts of the series circuit and the parallel circuit are respectively provided with a leading-out wire used for connecting a power supply, the end of the leading-out wire is provided with an alligator clip, the first power box 2 and the second power box 3 are respectively internally provided with a direct-current power supply, the voltage of the first power box 2 is greater than that of the second power box 3, the two power boxes can adopt dry batteries to provide power voltage, the voltage of the first power box 2 is 4.5V, the voltage of the second power box 3 is 3V, positive and negative connecting wires of the first power box 2 and the second power box 3 are respectively led out from the boxes, and the ends of the positive and negative connecting wires of the power supply are respectively provided with the alligator clip. The three connecting wires can be prepared, the two ends of each connecting wire are respectively provided with an alligator clip, two connecting wires can be used for detecting wires when an ammeter 5 and a voltmeter 4 are used for measuring, the other connecting wire can be used for short-circuiting an electric lamp, and the connecting structure of the circuit is verified by a short-circuiting method. Box 1 is last to articulate to be fixed with case lid 10, can make series circuit case, parallel circuit case, first power supply case 2, second power supply case 3, voltmeter 4, ampere meter 5 dress in box 1 through case lid 10, is convenient for accomodate, avoids experimental apparatus to lose, also makes things convenient for the teacher to carry and tests the show for the student. The cover 10 is provided with a protective foam, which can protect the electric lamp when the cover 10 covers the case 1, and prevent the electric lamp from colliding with the cover 10 and being damaged.
The series circuit box comprises a first series circuit box 6 and a second series circuit box 7, exposed binding posts of two electric lamps on the first series circuit box 6 are arranged on the same straight line extension line, and exposed binding posts of two electric lamps on the second series circuit box 7 are respectively arranged on two straight lines; the parallel circuit box comprises a first parallel circuit box 8 and a second parallel circuit box 9, exposed binding posts of two electric lamps on the first parallel circuit box 8 are arranged on the same straight line, and exposed binding posts of two electric lamps on the second parallel circuit box 9 are respectively arranged on the two straight lines. Although the actual circuit connection structures of the two series circuit boxes in the box are the same, and the circuit connection structures of the two parallel circuit boxes in the box are also the same, different lamp arrangement modes can visually form different effects for students, so that the curiosity of the students is stimulated, and the understanding of the students on the rule characteristics of the series circuit and the parallel circuit is deepened.
When the black box reveal-reveal teaching instrument is used, the circuit structure and the voltage in the box can be verified through the following experimental methods:
1. tamper-evident experiment method for series circuit box and parallel circuit box
(1) Method of breaking circuit
A power supply box is connected with any one circuit box to provide power, two lamps emit light, one lamp is unscrewed from the circuit box at will, and whether the rest lamps on the circuit box emit light or not is observed. According to the rule and characteristics of the series and parallel circuits, the following characteristics are known: if the rest lamp can not continuously emit light, the two lamps on the circuit box can be judged to be in series connection, and if the rest lamp can continuously emit light, the two lamps on the circuit box can be judged to be in parallel connection. Similarly, the same operation can be used to verify the connection mode of other circuit boxes. After the experiment is finished, each circuit box is opened, whether the experimental result is consistent with the circuit connection mode in the box or not is checked, and the actual connection condition of the circuit is intuitively sensed.
(2) Short circuit method
One connecting wire is used for instantly connecting any one electric lamp on the circuit box, and the characteristics of the rules of the series and parallel circuits can be known as follows: the short-circuited lamp in the series circuit is not lit, and the other lamp continues to emit light; both lamps in the parallel circuit do not emit light and can therefore be used to verify whether the experimental results obtained are correct.
(4) Method for measuring current
The current in the estimating circuit determines the range of 0-0.6A, and since each circuit box is a black box and the current direction in the lamp is not known, the test touch operation is required to measure the current of each lamp. To measure the current at a certain position, the position needs to be disconnected firstly, then the ammeter is connected in series at the position, then the deflection condition of the pointer of the ammeter is observed, if the pointer is reversely deflected, two binding posts of the ammeter need to be connected in an exchange manner, and the current value can be read only when the pointer is deflected normally. According to the rule and characteristics of the series and parallel circuits, the following characteristics are known: the two electric lamps of the series circuit box and the current at each position outside the box are equal in magnitude; the sum of the currents of the two lamps of the parallel circuit box is equal to the current of the trunk circuit outside the box, so that whether the obtained experimental result is correct or not can be verified.
(4) Method for supplying power by same power supply
An ammeter, an arbitrary power supply box, and a first series circuit box 6 and a first parallel circuit box 8 are used. Since the voltage of the same power supply is not changed, the voltage of the power supply box is set to be U, the resistance (also called internal resistance) of the power supply is set to be R, the total resistance of the first series circuit box 6 is set to be R1, the total resistance of the first parallel circuit box 8 is set to be R2, and the resistance value change of the electric lamp along with the brightness in the experimental process can be ignored. According to the rule and characteristics of the series and parallel circuits, the following characteristics are known: under the condition that the power supply voltage is the same, the resistance of two lamps with the same specification in series connection is larger than that in parallel connection, the total current value of the series circuit is smaller than that of the parallel circuit, and the total power of the series circuit is smaller than that of the parallel circuit. Therefore, during the experiment, the same power box is connected with the two circuit boxes in sequence, and the connection mode of the circuit can be judged from the following aspects:
firstly, the brightness of the lamps on each circuit box is respectively observed, the circuit box with lower lamp brightness is a first series circuit box 6, and the circuit box with higher lamp brightness is a first parallel circuit box 8. Similarly, the same operation can be used to verify the connection mode of other circuit boxes. After the experiment is finished, each circuit box is opened, and whether the experimental result is consistent with the circuit connection mode in the box or not is checked.
Comparing the total current, measuring the total current when the first series circuit box 6 and the first parallel circuit box 8 are respectively connected with the same power supply by using the ammeter 5, and respectively marking as I1、I2From ohm's law: i is1=U/(R1+r)、I2=U/(R2+ r), the circuit box with the smaller total current is the first series circuit box 6, and the circuit box with the larger total current is the first parallel circuit box 8. Similarly, the same operations can be used for othersAnd verifying the connection mode of the circuit box. After the experiment is finished, each circuit box is opened, and whether the experimental result is consistent with the circuit connection mode in the box or not is checked.
Comparing the total power, P = UI, and P = U2the/R is known as follows: the total resistance of the circuit with small total current is small, so that the circuit with small total current is deduced to be the first series circuit box 6, and the circuit box with large total current is the first parallel circuit box 8.
(5) Method for measuring voltage
The voltage of two ends of the electric lamp is estimated according to the brightness of the electric lamp, the range of 0-3V is selected, and because all circuit boxes are black boxes and the current direction in the electric lamp is unknown, a touch operation is required to be performed, and the reverse deviation of a pointer is prevented. According to the rule and characteristics of the series and parallel circuits, the following characteristics are known: the voltage across the series circuit box is equal to the sum of the voltages across the two lamps; the voltage across the parallel circuit box is equal to the voltage across the two lamps.
2. Power box disclosure experimental method
(1) And deducing the voltage of the two power boxes according to the decryption result of the circuit box.
Because the two lamps in the series circuit have low brightness and the two lamps in the parallel circuit have high brightness under the same power supply, if the brightness of the series circuit of the two lamps is the same as the brightness of the parallel circuit of the two lamps, the power supply voltage for supplying power to the series circuit must be increased. Therefore, in the experiment process, the first power supply box 2 supplies power to the first series circuit box 6, so that two electric lamps on the first series circuit box 6 emit light; the second power supply box 3 supplies power to the first parallel circuit box 8, so that the two lamps on the first parallel circuit box 8 emit light, the current passing through the four lamps with the same specification is approximately 0.24A measured by the current meter, and the voltage at the two ends of the four lamps is approximately 2V measured by the voltage meter, so that the brightness of the four lamps is very close. It can be seen that, since the first series circuit box 6 is known as a series connection of two lamps, the power supply voltage of the first power supply box 2 supplying power thereto is higher; and the first parallel circuit box 8 is known to have two lamps in parallel, the supply voltage of the second power supply box 3 supplying power thereto is low.
(2) And two power supply boxes are used for supplying power to the same circuit box respectively, and which power supply voltage is higher in the two power supply boxes is judged.
The first series circuit box 6 is selected to receive power supply of the first power box 2 and the second power box 3 respectively, and experiments show that the first power box 2 can enable two lamps of the first series circuit box 6 to be brighter, so that the power voltage of the first power box 2 is higher, and the power voltage of the second power box 3 is lower. The method can be used for verifying whether the experimental result is accurate.
This black box reveal secret demonstrator sets up the series circuit case in box 1, the parallel circuit case, first power supply case 2, second power supply case 3, each circuit case and power supply case hide circuit connection structure in the case through the case lid respectively, make student's experiment in-process can't see specific circuit connection structure and voltage size, learn the connection structure of incasement through experimental operation as the student, to the cluster on the sense organ, after parallel circuit's connection and voltage size had known, can open the case lid that corresponds and reveal secret the verification, thereby audio-visual sense circuit's actual connection and the specific voltage size in the power supply case are felt, accomplish the teaching activity, reach good teaching effect.
Moreover, the black box reveal-reveal teaching instrument can adopt a plurality of experimental ideas such as a circuit breaking method, a same power supply method and the like to judge the circuit connection mode of each circuit box, train students to infer the total resistance magnitude relation of the series circuit and the parallel circuit, deepen the understanding and memory of the students on ohm's law and power calculation, enable the students to visually experience the actual connection condition of the series circuit and the parallel circuit and help the students to understand the series principle and the parallel principle; students can also learn the use methods of the ammeter and the voltmeter. Meanwhile, the voltage of the first power box 2 and the second power box 3 can be judged by reasoning and observing the brightness of the electric lamp, so that students can more intuitively understand the voltage. In addition, the black box reveal teaching instrument can guide students to think and explore other reveal methods, verify the circuit types in each circuit box, fully arouse the curiosity and enthusiasm of the students for circuit learning, and arouse the learning interest of the students. Especially, when the physical general review of middle school is carried out, the black box reveal and reveal teaching instrument can reduce the boring in the review and greatly improve the learning interest of students. Moreover, the black box reveal-reveal demonstration instrument is concise and standard in manufacture, easy to operate in experiments, convenient to carry and remarkable in experiment teaching effect.
Claims (9)
1. The utility model provides a series, parallel circuit black box reveal secret demonstrator which characterized in that: comprises a box body (1), wherein a series circuit box, a parallel circuit box, a first power box (2), a second power box (3), a voltmeter (4) and an ammeter (5) which are respectively independent are arranged in the box body (1), the series circuit box, the parallel circuit box, the first power box (2) and the second power box (3) are respectively provided with a box cover which can be opened, two electric lamps are respectively and fixedly arranged on the box covers of the series circuit box and the parallel circuit box, wherein the series circuit is arranged in the series circuit box and connects the two electric lamps in series, the parallel circuit is arranged in the parallel circuit box and connects the two electric lamps in parallel, exposed binding posts are respectively arranged on two sides of each electric lamp, lead-out wires for connecting a power supply are respectively arranged outside the series circuit and the parallel circuit, and direct current power supplies are respectively arranged in the first power box (2) and the second power box (3), the voltage of the first power box (2) is greater than that of the second power box (3), and power supply positive and negative connecting wires of the first power box (2) and the second power box (3) are led out from the boxes; also included are connecting wires for detecting voltage or current, and making short circuits.
2. The series-parallel circuit black box reveal teaching instrument according to claim 1, wherein: the series circuit box comprises a first series circuit box (6) and a second series circuit box (7), exposed binding posts of two electric lamps on the first series circuit box (6) are arranged on the same straight line extension line, and exposed binding posts of two electric lamps on the second series circuit box (7) are respectively arranged on two straight lines.
3. The series-parallel circuit black box reveal teaching instrument according to claim 1, wherein: the parallel circuit box comprises a first parallel circuit box (8) and a second parallel circuit box (9), exposed binding posts of two electric lamps on the first parallel circuit box (8) are arranged on the same straight line, and exposed binding posts of two electric lamps on the second parallel circuit box (9) are respectively arranged on the two straight lines.
4. The series-parallel circuit black box reveal teaching instrument according to claim 1, wherein: the voltage of the first power box (2) is 4.5V, and the voltage of the second power box (3) is 3V.
5. The series-parallel circuit black box reveal teaching instrument according to claim 1, wherein: a box cover (10) is hinged and fixed on the box body (1).
6. The series-parallel circuit black box reveal teaching instrument according to claim 5, wherein: the box cover (10) is provided with protective foam.
7. The series-parallel circuit black box reveal teaching instrument according to claim 1, wherein: the utility model discloses a box, including box (1), series circuit case, parallel circuit case, first power supply case (2), second power supply case (3), box (1) interior symmetry is equipped with two first mounting grooves (11), be located two first mounting grooves (11) respectively, set up second mounting groove (12) that are used for placing voltmeter (4), ampere meter (5), connecting wire between two first mounting grooves (11).
8. The series-parallel circuit black box reveal teaching instrument according to claim 1, wherein: the box covers of the series circuit box, the parallel circuit box, the first power box (2) and the second power box (3) are fixed in a hinged mode or are respectively connected with the box bodies through magnets.
9. The series-parallel circuit black box reveal teaching instrument according to claim 1, wherein: magnets are arranged at the bottom of the cavity of the box body (1) and the bottoms of the series circuit box, the parallel circuit box, the first power box (2) and the second power box (3) respectively, and the series circuit box, the parallel circuit box, the first power box (2) and the second power box (3) are fixed in the box body (1) through the magnets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121176547.9U CN215265239U (en) | 2021-05-28 | 2021-05-28 | Series-parallel circuit black box reveal teaching instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121176547.9U CN215265239U (en) | 2021-05-28 | 2021-05-28 | Series-parallel circuit black box reveal teaching instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215265239U true CN215265239U (en) | 2021-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121176547.9U Expired - Fee Related CN215265239U (en) | 2021-05-28 | 2021-05-28 | Series-parallel circuit black box reveal teaching instrument |
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| Country | Link |
|---|---|
| CN (1) | CN215265239U (en) |
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2021
- 2021-05-28 CN CN202121176547.9U patent/CN215265239U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211221 |