CN204758700U - Adopt resistance to select separately teaching aid of measuring circuit - Google Patents
Adopt resistance to select separately teaching aid of measuring circuit Download PDFInfo
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- CN204758700U CN204758700U CN201520372161.3U CN201520372161U CN204758700U CN 204758700 U CN204758700 U CN 204758700U CN 201520372161 U CN201520372161 U CN 201520372161U CN 204758700 U CN204758700 U CN 204758700U
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- resistance
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Abstract
The utility model discloses an adopt resistance to select separately teaching aid of measuring circuit, including the power, single armed bridge circuit, the power to single armed bridge circuit provide voltage, single armed bridge circuit input has still concatenated switch and slide rheostat, single armed bridge circuit's an arm constitutes first resistance (R1, R2) by the resistance box, and its another arm is made up with module resistance by the resistor cartridge and constitutes second resistance (R3, R4), first resistance (R1, R2) with between the second resistance (R3, R4) and connect the galvanometer, this teaching aid can arouse the student to resistance measurement knowledge interest in learning, promotes that the student constantly seeks the knowledge innovation to resistance measurement, has guaranteed student's results of learning effectively, has increased the confidence that the student undertook challenge study.
Description
Technical field
The utility model relates to a kind of teaching aid to resistance measurement, particularly relates to a kind of teaching aid adopting resistance sorting metering circuit.
Background technology
In education experiment, multimeter and direct current bridge are conventional educational aids student being carried out to the measurement of resistance.Particularly direct current wheatstone bridge, with its simple principle, enlightenment by force, can help student resistance measurement knowledge to be carried out to the advantages such as clearly cognition and be widely adopted in teaching.But this teaching aid is not enough to some extent in the innovation enthusiasm exciting student and challenge.
Utility model content
For problems of the prior art, the utility model provides a kind of teaching aid and the teaching method thereof that adopt resistance sorting metering circuit, this teaching aid and teaching method thereof can excite student to resistance measurement knowledge learning interest, promote that student constantly seeks resistance measurement knowledge innovation, effectively ensure that the results of learning of student, add the confidence that student bears challenge study.
For solving the technical matters existed in prior art, the utility model adopts following technical scheme: a kind of teaching aid adopting resistance sorting metering circuit, comprises power supply, single-arm bridge type circuit; Described power supply provides voltage to described single-arm bridge type circuit, described single-arm bridge type circuit input end is also serially connected with switch and slide rheostat, one arm of described single-arm bridge type circuit forms the first resistance (R1 by resistance box, R2), its another arm is combined by resistor cartridge and module resistance and forms the second resistance (R3, R4), described first resistance (R1, R2) galvanometer is connected to and between described second resistance (R3, R4).
Described second resistance is that described module resistance is in parallel or be connected in series on described resistor cartridge in blocks.
Described resistor cartridge is 9 orifice plates.
The utility model beneficial aspects: the first, the teaching aid that the utility model provides and teaching method can effectively help student to measure study to resistance sorting, demonstrate combining with teaching method again and make student's fast understanding content, reach effect of getting twice the result with half the effort by teaching aid.The second, the teaching aid that the utility model provides and teaching method to the Logic judgment of student's transfer complex, greatly excite the innovation ability of student by running program cleverly, tempered students ' practical ability, enhanced the confidence of inquiry learning of accepting challenges.
Accompanying drawing explanation
Fig. 1 is a kind of teaching aid adopting resistance sorting metering circuit of the utility model.
Fig. 2 is a kind of teaching aid experiment resistance R3=R4 operational flowchart utilizing resistance sorting metering circuit of the utility model.
Fig. 3 is a kind of teaching aid experiment resistance R3>R4 operational flowchart utilizing resistance sorting metering circuit of the utility model.
Fig. 4 is a kind of teaching aid experiment resistance R3<R4 operational flowchart utilizing resistance sorting metering circuit of the utility model.
Reference numeral
Embodiment:
Below in conjunction with accompanying drawing, the utility model is described in more detail:
As shown in Figure 1, the utility model provides a kind of teaching aid adopting resistance sorting metering circuit, comprises power supply 21, single-arm bridge type circuit; Described power supply 21 provides voltage to described single-arm bridge type circuit, described single-arm bridge type circuit input end is also serially connected with switch 22 and slide rheostat 23, one arm of described single-arm bridge type circuit forms the first resistance (R1 by resistance box 24, R2), its another arm is combined by resistor cartridge 25 and module resistance 26 and forms the second resistance (R3, R4), described first resistance (R1, R2) galvanometer 27 is connected to and between described second resistance (R3, R4).Described second resistance (R1, R2) for described module resistance in blocks serial or parallel connection on described resistor cartridge.Described resistor cartridge is 9 orifice plates.
The utility model can also adopt a kind of teaching method technical solution problem adopting resistance sorting to measure teaching aid: its step is as follows:
The first, first connect resistance sorting and measure teaching aid power supply, regulate slide rheostat and galvanometer simultaneously, ensure that teaching aid measuring process accuracy is measured in described resistance sorting;
The second, regulate described resistance sorting to measure the first resistance (R1, R2) in teaching aid, make R1=R2, described second resistance (R3, R4) is compared simultaneously,
3rd, described second resistance (R3, R4) in described step 2 is divided into groups according to 1 ~ 6; Best, by the second resistance (R3 described in step 2, R4) it is one group according to 4, according to the size of bridge balance wherein two groups of resistant series or resistance in parallel, at least compare just wherein special resistance can be sorted out for three times and know its value relatively with the size of other two class values.4th, the size of described second resistance (R3, R4) is known by the direction observing the deflection of described galvanometer.
In described step 2, ((R1, R2) adopts resistance box to the first resistance.
(resistance that two resistances are identical of two resistance boxes in (R1, R2) substitutes for first resistance in described step 2.
In described step 2, (two resistance boxes in (R1, R2) can adopt measured resistance to substitute to the first resistance.
As shown in Figure 2, Figure 3, Figure 4, wherein 12 resistance are by label, A1 ~ A4, B1 ~ B4, C1 ~ C4, and each operation judges according to the magnitude relationship of R3, R4, and follow-up judgement also will utilize R3, R4 magnitude relationship above and the position residing for each resistance.During measurement, make R3=A1+A2+A3+A4, R4=B1+B2+B3+B4, close a switch S, judges R3=R4, R3>R4, R3<R4 tri-kinds of situations according to galvanometer instruction.
Now, we utilize teaching aid of the present utility model, adopt method of the present utility model to carry out the experimental teaching of electrical bridge principle sorting resistance to student.Organize the student selecting the resistance that one is substandard products in 12 resistance, resistance is bigger than normal or much less than normal, requires find out substandard products resistance by minimum number of comparisons and measure its resistance.Experimental technique regulates to make R1=R2, carries out the compare operation of R3, R4.
Most straightforward procedure be exhaustive, R3, R4 is allowed to be a resistance, each like this two resistance compare, if bridge balance illustrates that two resistance are certified products, uneven explanation has substandard products inside two resistance, the certified products resistance judged again and compares respectively, just can know which substandard products resistance be and know that resistance is bigger than normal or less than normal for 8 times at most.
Challenging experimental technique can accomplish that bridge arm ratio just can be found out substandard products resistance compared with 3 times and know that it is bigger than normal less than normal.
(1) 12 resistance is divided into three groups of A, B, C, often organizes 4.Each 4 series connection of first time AB two groups are connected into R3, R4 place respectively and compare.If uneven, illustrate that C group 4 is certified products, substandard products are in AB group.If balance, illustrates that AB group is certified products, has substandard products in C group.
(2) through comparing, if balance, substandard products, in C group, are connected into R3 from C group taking-up 2 series connection, then take out C group and each 1 series connection of A group is connected into R4, compare.If balance, what C group stayed is substandard products, then compares with certified products, can deal with problems for 3 times; If uneven, two resistance taking out R3 position are connected into R3, R4 respectively and compare, if magnitude relationship does not change, so the resistance at R3 place is substandard products, otherwise R4 place is substandard products, then judges the size of substandard products according to magnitude relationship.
(3) if substandard products are in A, B group, remember the magnitude relationship of current AB group, then take out each 1 series connection of ABC group and be connected into R3,1 series connection of B group 2 C groups is connected into R4, compares and writes down magnitude relationship.At this moment 5 leave a question open resistance and 1 certified products resistance on electric bridge, below 3 resistance that leave a question open.If bridge balance, on electric bridge, 5 resistance are certified products, below 3 leave a question open; Otherwise there are substandard products in 5 resistance on electric bridge.
(4) if below 3 leave a question open, 2 of 3 middle A groups that leave a question open access bridge arm ratios comparatively.If balance, then remaining B group that be substandard products, can judge that substandard products bigger than normal or less than normal according to the magnitude relationship recorded above; If uneven, see whether magnitude relationship changes, if unchanged, be then that resistance of R3 position is substandard products; If changed, be exactly R4 position be substandard products, according to start time record magnitude relationship judge substandard products size.
If 5 resistance leave a question open, first see that whether magnitude relationship is consistent with the result of that time initial, if changed, so the B group resistance of R3 position and the A group resistance of R4 position leave a question open, and one of these two relatively can be dealt with problems with certified products.If magnitude relationship does not become, then other 3 resistance leave a question open, wherein B group 2, A group 1, A group is taken off, is connected on R3, R4 respectively by 2 of B group, if balance, what A group was taken off is substandard products, if uneven, see whether magnitude relationship changes, and changes, R3 that be substandard products, do not change, R4 that be substandard products, large I according to above comparative result judge.
In addition, also can without rheostat relatively time.Only need change first time to compare:
12 resistance are divided into three groups of A, B, C, often organize 4.A group is divided equally 2 groups to connect respectively and be connected into R1, R4, then B group is divided equally 2 groups and connect respectively and be connected into R2, R3, compare and record result.If balance, then illustrate that AB group is normally, take out 2 and be connected into R1, R2 replacement rheostat respectively; If uneven, then can determine that C group is normally, take out 2 and replace rheostat, also compare simultaneously with size, and directly compare coming to the same thing of size that A group B component do not connect.So still can reach and originally identical effect after changing, 2 times next can not be affected and compare.
Those of ordinary skill in the art will be understood that in actual applications, and in the utility model, some change all may occur the set-up mode of each parts, and other staff also may make similar Design under its enlightenment.It is pointed out that only otherwise depart from design aim of the present utility model, all apparent changes and similar Design thereof, be all included within protection domain of the present utility model.
Claims (3)
1. adopt a teaching aid for resistance sorting metering circuit, comprise power supply, single-arm bridge type circuit; It is characterized in that, described power supply provides voltage to described single-arm bridge type circuit, described single-arm bridge type circuit input end is also serially connected with switch and slide rheostat, one arm of described single-arm bridge type circuit forms the first resistance (R1, R2) by resistance box, and its another arm is combined by resistor cartridge and module resistance and forms the second resistance (R3, R4), be connected to galvanometer between described first resistance (R1, R2) and described second resistance (R3, R4).
2. adopt the teaching aid of resistance sorting metering circuit according to claim 1 one kind, it is characterized in that, described second resistance is that described module resistance is in parallel or be connected in series on described resistor cartridge in blocks.
3. adopt the teaching aid of resistance sorting metering circuit according to claim 1 one kind, it is characterized in that, described resistor cartridge is 9 orifice plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520372161.3U CN204758700U (en) | 2015-06-02 | 2015-06-02 | Adopt resistance to select separately teaching aid of measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520372161.3U CN204758700U (en) | 2015-06-02 | 2015-06-02 | Adopt resistance to select separately teaching aid of measuring circuit |
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| Publication Number | Publication Date |
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| CN204758700U true CN204758700U (en) | 2015-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520372161.3U Expired - Fee Related CN204758700U (en) | 2015-06-02 | 2015-06-02 | Adopt resistance to select separately teaching aid of measuring circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865444A (en) * | 2015-06-02 | 2015-08-26 | 天津大学 | Teaching aid adopting resistance sorting measurement circuit and teaching method thereof |
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2015
- 2015-06-02 CN CN201520372161.3U patent/CN204758700U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865444A (en) * | 2015-06-02 | 2015-08-26 | 天津大学 | Teaching aid adopting resistance sorting measurement circuit and teaching method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151111 Termination date: 20180602 |