Question

State ohm’s Law. How can this law be verified experimentally?. Does ohm's law hold good under all conditions? comment.

Answer 1

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Ohm's Law:

According to Ohm law temperature remaining constant the current passing through conductor is directly proportional to the potential difference across it's end's.

Activity to verify Ohm's Law:

                                              V=IR

                               V is directly proportional to I

Here, constant R is known as the Resistance of given conductor.For a given conductor it's Resistance is constant at a given temperature.

The circuit Diagram of the experimental set up has been shown. Here, XY is the Resistance wire, A an Ammeter and V an Voltmeter. A battery of 4 cells is being used as a current source and K is a Plug Key.

Initially use one cell only. Put Plug in Key K and note current an voltage by noting Ammeter and Voltmeter reading respectively. Let these be I1 and V1.

Then connect the two cell's in the circuit and note current I2 and potential Difference V2 across the resistance. Similarly, take reading's with 3 and 4 cell's in the circuit. From the observation's we find that..,,,

                                V/I=V/I=V/I=V/I=a constant=R

If we Plot V-I Graph comes out to be a straight line. It experimentally verifies Ohm's law.

Ohm's Law does not hold good under all condition.

It is true for metal's and alloy's only provided that temperature does not change during the course of experiment.

Hope it help's

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Answer 2

Ohm's law states that at constant temperature the current passing through the conductor is directly proportional to the potential difference across its ends.

• To verify Ohm's law experimentally a circuit is made that consists of an ammeter, voltmeter, connecting wires, battery, switch, and resistance. Then we will note the readings by changing the resistance.
• Then we will plot a V-I graph which comes out be a straight line, which will verify Ohm's law.
• Ohm's Law does not hold good under all conditions.
• It is true for metals and alloys only provided that temperature does not change during the course of the experiment.

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