Question

(Long Answer Type Questions)
State and explain Ohm's Law and how can Ohm's Law be verified
experimently
Okuysuoo sumoptof əy jo yöryM (II)
( 8 )
cara​

Answer 1

Explanation:

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

Mathematically we can write:

I∝V

or I=VR

Here, constant R is known as the Resistance of given conductor.

For a given conductor it's Resistance is constant at a given temperature.

One can verify Ohm's law by following Experiment:

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.

Step 1:

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 I

1

and V

1

Step 2:

Then connect the two cell's in the circuit and note current I

2

and potential Difference V

2

across the resistance.

Step 3:

Similarly, take reading's with 3 and 4 cell's in the circuit.

From the observation's we find that

V

1

/I

1

=V

2

/I

2

=V

3

/I

3

=V

4 /I

4=constant=R

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

No, It doesn't hold under conditions like non-constant temperature and pressure.

It is true for conductors only.