Question

In an experiment on studying dependence of the current on potential difference across it . List two methods how a student can change the value of current in the circuit

Answer 1

If a student while studying the dependence of current on the potential difference keeps the circuit closed for a long time to measure the current and potential difference, then (a)  Ammeter’s zero error will change(b)  Ammeter’s will give more reading(c)  Voltmeter will show constantly higher readings(d)  Resistor will get heated up and its value will change

Answer 2

Rheostat which helps in the increasing or decreasing the current.

By switching off the circuit.