CN2891154Y - Joule's law demonstrator - Google Patents

Joule's law demonstrator Download PDF

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Publication number
CN2891154Y
CN2891154Y CN 200620019495 CN200620019495U CN2891154Y CN 2891154 Y CN2891154 Y CN 2891154Y CN 200620019495 CN200620019495 CN 200620019495 CN 200620019495 U CN200620019495 U CN 200620019495U CN 2891154 Y CN2891154 Y CN 2891154Y
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storage box
gas storage
panel
liquid
back side
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Expired - Fee Related
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CN 200620019495
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Chinese (zh)
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殷光林
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Individual
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Individual
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Abstract

The utility model discloses a demonstration device for Joule's law, comprising a face board (1), an air tank (2), an air tank (3), an air drain screw cap (4), a soft rubber hose (5), a rubber hose interface (6), a U-shaped glass tube (7), a liquid (8), a graduated scale (9), a current meter (10), a potentiometer (11), a switch (12), a binding post (13) and a metal movable foil (14). The utility model makes the complex principle simple and direct, and the demonstration device is easy to operate. The utility model uses experiment to make the complex theory simple and visual. The demonstration uses the air as heated substance, thereby saving material, shortening the demonstration time and improving the classroom efficiency. All elements are on one face plate, so the maintenance is easy and the carrying is convenient.

Description

The Joule law demonstration device
Technical field
The utility model relates to a kind of teaching aid, especially a kind of Joule law demonstration device.
Technical background
Joule law promptly is that emphasis is again a difficult point in junior middle school physics teaching, and the teacher has the desirable demonstration instrument of a cover in professor's Joule law process be very important.The experimental provision that provides in physics teaching material at present is to fill it up with kerosene in two flasks, be respectively equipped with heating wire therein, the heat that utilizes heating wire to produce makes the kerosene expanded by heating, reflect what of heat that heating wire produces by the height of kerosene rising glass tube, thereby demonstrate the relation between Q and R, I in the Joule law, the t three.This technology exists: complicated operation, perishable bottle stopper, contaminated air, many deficiencies such as heat time heating time is long, setup time is long, and also heat dissipation is serious, can make error big.Owing to there is such deficiency, do not used by vast school, just tell about theory merely when many teachers lecture Joule law, and do not have that a cover is simple, practicality, the lecture experiment instrument is verified Joule law efficiently.
Summary of the invention
The utility model purpose is to overcome above deficiency, provide a kind of simple in structure, effect obviously, can finish many group experiments fast, form contrast, make the demonstration device of student's fast understanding Joule law.
The utility model realizes that in the following manner the utility model is made up of panel (1), gas storage box (2), gas storage box (3), valve nut (4), flexible rubber hose (5), sebific duct interface (6), U type glass tube (7), liquid (8), rule (9), reometer (10), potentiometer (11), switch (12), binding post (13), metal movable plate (14).Hard material is as the panel (1) of all elements of layout.The right and left positive at panel (1) sets up two airtight gas storage box (2) and gas storage box (3) that volume is identical separately, and gas storage box is to be made by material not yielding, Heat stability is good.Establish resistance wire or heater R that two resistances equate in the gas storage box (2) 1And R 2, R 1Joint a, the b at two ends passes the back side of gas storage box (2) to panel (1), R 2Joint c, the d at two ends passes the back side of gas storage box (2) to panel (1).Establish resistance wire or heater R in the gas storage box (3) 3, an end connector f passes the back side of gas storage box (3) to panel (1).Resistance wire or heater R are established in the position of corresponding gas storage box (3) at the back side of panel (1) 4, the one end is established joint e.R wherein 1=R 2=R 3=R 4Gas storage box (2), be equipped with valve nut (4) and sebific duct interface (6) above the gas storage box (3), valve nut (4) is used to seal valve, and valve is used for the gas storage box ventilation.Be connected with sebific duct interface (6) on two gas storage box respectively with the flexible rubber hose (5) of two length unanimities, the other end of flexible rubber hose (5) is connected with U type glass tube (7).One section liquid (8) is housed in U type glass tube, and liquid (8) is with the air seal in two gas storage box, and situation about expanding according to gas in the gas storage box is observed the height that liquid level rises simultaneously, thereby determines that what of heat resistance wire or heater produce.Liquid (8) should satisfy not volatile, stable in properties, and the height of observing the fluid column rising for convenience can be a colour liquid.Two U-shaped pipes are fixed on the rule (9), and rule is used to measure the height that U-shaped intraluminal fluid face rises, thereby determine that what of heat resistance wire or heater produce.With lead with reometer (10), potentiometer (11), switch (12) and power supply on panel, connect the back link to each other with four resistance wires or heater, formation path.Binding post (13) connects low-voltage dc power supply, can be 6 volts of direct supplys.In connection procedure, connector lug is reached the back side of panel as far as possible, make device succinct, attractive in appearance.
The position of two gas storage box in the back side correspondence of panel (1) and establish metal movable plate (14).Jointing a, b, c, d or e, f form circuit arbitrarily by stirring the metal movable plate.
Connect bd two contacts with the metal movable plate, make the R in the gas storage box of the left side 1And R 2Series connection, the right only with the R in the gas storage box 3In the place in circuit, R 4Place in circuit not.With lead with reometer, potentiometer, switch, power supply, R 1, R 2, R 3Series connection.The pass of the resistance in gas storage box (2), the gas storage box (3) is R at this moment 1+ R 2=2R 3, so just can verify in the identical time, electric current one timing of passing through, the height that can be observed the U type pipe liquid rising that links to each other with gas storage box (2) is big, proves that the heat of the big more generation of resistance is many more.Can verify to draw that the heat Q that electric current produces in the Joule law is directly proportional with resistance R.
Connect ad (or bc) two contacts with the metal movable plate, only with the R in the gas storage box of the left side 1Or R 2In any one resistance wire or heater place in circuit, the metal movable plate of stirring back side of panel is with 2 connections of ef, the R in the gas storage box of the right 3R with back side of panel 4Back in parallel place in circuit.With R 3, R 4Back in parallel and reometer, potentiometer, switch, power supply, R 1(or R 2) series connection formation path.This moment is by R in the gas storage box (2) 1(or R 2) electric current be by the R in the gas storage box (3) 3The twice of electric current, i.e. I 1=2I 3Like this in the identical time, resistance one timing, the height that can be observed the U type pipe liquid rising that links to each other with gas storage box (2) is big, proves that the heat of the big more generation of electric current is many more, can verify to draw square being directly proportional of the heat Q that electric current produces in the Joule law and electric current.
Stir the metal movable plate with 2 connections of ac, make the R in the gas storage box of the left side 1And R 2Places in circuit not is only with the R in the gas storage box of the right 3Place in circuit, reometer, potentiometer, switch, power supply, R at this moment 3Series connection.Therefore only need observe and be connected the rising of U-shaped pipe liquid with gas storage box (3).Registration on the read current table, in the different time, the position of the coloured liquid level in the record U-shaped pipe, explanation is certain at electric current, resistance one timing, the heat of long more generation conduction time is many more, can verify out that electric current produces in the Joule law heat and conduction time are directly proportional.
The utility model has the advantages that make complicated principle become by experiment simply, directly perceived and demonstration device is easy to operate.With the air material that is heated, thereby make variation effect obvious, be easy to observe, and saved raw material, shortened the demonstration time, improved classroom efficiency.Particularly the utility model utilization stir the metal movable plate can be fast with resistance wire or heater R 1, R 2, R 3And R 4Connect into series, parallel or series and parallel circuit.Thereby make the controllability of experiment stronger, also satisfy Joule law Q=I easily 2The heat that electric current produces by conductor among the Rt follows the quadratic power of electric current to be directly proportional, and follows the resistance of conductor to be directly proportional, follows the required experiment condition that is directly proportional conduction time.All elements of the utility model are all assembled on a panel, so safeguard easily, are easy to carry, and have overcome some deficiency in the current teaching materials.Satisfy the basic demand of teaching demonstration experimental apparatus, help promoting the use of of numerous teachers and students.
Description of drawings
Below in conjunction with accompanying drawing and specific embodiments the utility model is described in further detail:
Fig. 1 is a front view (FV) of the present utility model;
Fig. 2 is a back view of the present utility model;
Fig. 3 is a back side of the present utility model circuit diagram;
Fig. 4 is the circuit diagram that concerns between checking Q and the R;
The circuit diagram that concerns between checking Q and the I during Fig. 5;
Fig. 6 be concern between checking Q and the t circuit diagram;
Embodiment
By the hard plate of a 300 * 240mm panel (1) as all elements of layout.The right and left at panel sets up two airtight gas storage box (2) and gas storage box (3) that volume is identical separately, and gas storage box is to be made by material not yielding, Heat stability is good.Establish resistance wire or heater R that two resistances are 4 Ω in the gas storage box (2) 1And R 2, R 1Joint a, the b at two ends passes the back side of gas storage box (2) to panel (1), R 2Joint c, the d at two ends passes the back side of gas storage box (2) to panel (1).Establish resistance wire or heater R in the gas storage box (3) 3, an end connector f passes the back side of gas storage box (3) to panel (1).Resistance wire or heater R4 are established in the position of corresponding gas storage box (3) at the back side of panel (1), and the one end is established joint e.R 1＝R 2＝R 3＝R 4＝4Ω。Be equipped with valve nut (4) and sebific duct interface (6) above the gas storage box of the right and left, turn valve nut (4) and seal valve, two gas storage box all seal equivalent gas.With the flexible rubber hose (5) of two length unanimities respectively with gas storage box on the glue head take over (6) and link to each other, the other end of flexible rubber hose is connected with U type glass tube (7).With syringe the 1ml colored liquid is injected respectively in two U-shaped pipes.Two U-shaped pipes are fixed on the rule (9), and the scale on the rule increases progressively from the bottom to top one by one.As shown in Figure 3, with lead with reometer, potentiometer, switch, power supply on panel, connect the back link to each other with four resistance wires or heater, formation path.Binding post (13) connects 6 volts of direct supplys.
The position of two gas storage box in the back side of panel correspondence and establish metal movable plate (14).As described in Figure 4, stir the metal movable plate of back side of panel, connect bd two contacts, making the pass of the resistance in the gas storage box (2) (3) is R 1+ R 2=8 Ω=2R 3, checking draws, and the heat Q that electric current produces in the Joule law is directly proportional with resistance R.
By shown in Figure 5, the metal movable plate links to each other 2 connections of ad (or bc) again with 2 of ef, form current path.This moment R 1Or R 2=R 3=4 Ω, the electric current that passes through is: I 1=2I 3Checking draws, square being directly proportional of the heat Q that electric current produces in the Joule law and electric current.
The metal movable plate forms current path with 2 connections of ac.This moment R 3=4 Ω, I is constant.Only need to observe the U-shaped pipe liquid level on the right.Verify out that electric current produces in the Joule law heat and conduction time are directly proportional.
In conjunction with above operation, checking at last draws Joule law Q=I 2The heat that electric current produces by conductor among the Rt follows the quadratic power of electric current to be directly proportional, and follows the resistance of conductor to be directly proportional, with being directly proportional conduction time.

Claims (7)

1, a kind of Joule law demonstration device, form by panel (1), gas storage box (2), gas storage box (3), valve nut (4), flexible rubber hose (5), sebific duct interface (6), U type glass tube (7), liquid (8), rule (9), reometer (10), potentiometer (11), switch (12), binding post (13), metal movable plate (14), it is characterized in that hard material is as the panel (1) of all elements of layout; The right and left positive at panel (1) sets up two airtight gas storage box (2) and gas storage box (3) that volume is identical separately, establishes resistance wire or heater R that two resistances equate in the gas storage box (2) 1And R 2, R 1Joint a, the b at two ends passes the back side of gas storage box (2) to panel (1), R 2Joint c, the d at two ends passes the back side of gas storage box (2) to panel (1); Establish resistance wire or heater R in the gas storage box (3) 3, an end connector f passes the back side of gas storage box (3) to panel (1); Resistance wire or heater R are established in the position of corresponding gas storage box (3) at the back side of panel (1) 4, the one end is established joint e; The position that two gas storage box in the back side correspondence of panel (1) is respectively equipped with metal movable plate (14); Jointing a, b, c, d or e, f form circuit arbitrarily by stirring the metal movable plate; Gas storage box (2), be equipped with valve nut (4) and sebific duct interface (6) above the gas storage box (3), be connected with sebific duct interface (6) on two gas storage box respectively with the flexible rubber hose (5) of two length unanimities, the other end of flexible rubber hose (5) is connected with U type glass tube (7), one section liquid (8) is housed in U type glass tube, and liquid (8) is with the air seal in two gas storage box; Two U-shaped pipes are fixed on the rule (9), link to each other with four resistance wires or heater after with lead reometer (10), potentiometer (11), switch (12) and power supply being connected on panel, form path.Binding post (13) connects low-voltage dc power supply.
2, Joule law demonstration device according to claim 1 is characterized in that, power supply is 6 volts of direct supplys.
3, Joule law demonstration device according to claim 1 is characterized in that, gas storage box is to be made by material not yielding, Heat stability is good.
4, Joule law demonstration device according to claim 2 is characterized in that, gas storage box is to be made by material not yielding, Heat stability is good.
5, according to claim 1,2,3 or 4 described any Joule law demonstration devices, it is characterized in that R 1=R 2=R 3=R 4
6, according to claim 1,2,3 or 4 described any Joule law demonstration devices, it is characterized in that liquid (8) should satisfy not volatile, stable in properties, the height of observing the fluid column rising for convenience can be a colour liquid.
7, Joule law demonstration device according to claim 5 is characterized in that, liquid (8) should satisfy not volatile, stable in properties, and the height of observing the fluid column rising for convenience can be a colour liquid.
CN 200620019495 2006-05-01 2006-05-01 Joule's law demonstrator Expired - Fee Related CN2891154Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200620019495 CN2891154Y (en) 2006-05-01 2006-05-01 Joule's law demonstrator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200620019495 CN2891154Y (en) 2006-05-01 2006-05-01 Joule's law demonstrator

Publications (1)

Publication Number Publication Date
CN2891154Y true CN2891154Y (en) 2007-04-18

Family

ID=38021818

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200620019495 Expired - Fee Related CN2891154Y (en) 2006-05-01 2006-05-01 Joule's law demonstrator

Country Status (1)

Country Link
CN (1) CN2891154Y (en)

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GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20070418

Termination date: 20100501