Question

What will happen if a student by studying the dependence of current and potential difference keeps the circuit closed for long time to measure the current and potential difference?

Answer 1

If he will do so

the wire and resistors will heat up

due to ,(H=VIt).

Then the correct measure of ammeter and voltameter will change.

Because temperature affects resistance.

and as resistance changes

V and I also changes.

As,

R=V/I