Question

State Ohm’s law and write its mathematical expression. How will you verify this

law in school laboratory ? Explain in detail with the help of a diagram. ​

Answer 1

Ohm’s law states the relationship between electric current and potential difference. The current that flows through most conductors is directly proportional to the voltage applied to it. Georg Simon Ohm, a German physicist was the first to verify Ohm’s law experimentally.

So now you have to show this in your school but how?

Here you go-

Materials Required

1) Resistor

2) Ammeter

3) Voltmeter

4) Battery

5)Plug key

6) Rheostat

Procedure-

1) Initially, the key K is closed and the rheostat is adjusted to get the minimum reading in Ammeter A and voltmeter.

2)The current in the circuit is increased gradually by moving the sliding terminal of the rheostat. During the process, the current flowing in the circuit and the corresponding value of potential difference across the resistance wire R are recorded.

3)This way different sets of values of voltage and current are obtained.

4) For each set of values of V and I, the ratio of V/I is calculated.

For each set of values of V and I, the ratio of V/I is calculated.When you calculate the ratio V/I for each case, you will come to notice that it is almost the same. So V/I = R, which is a constant.

5)Plot a graph of the current against the potential difference, it will be a straight line. This shows that the current is proportional to the potential difference.

Done ✅