Question

Which of the following statement(s) is/are true, regarding the electrical set-up for verification of Ohm's law?

• A. The voltmeter is connected in parallel with the known resistance.
• B. The ammeter is connected in series in the circuit.
• C. The rheostat can only increase the resistance in the circuit.
• D. There is a sliding contact on the coil which is used to change the value of resistance.

Answer 1

Answer: (A), (B), (D)

The correct options are
A

The voltmeter is connected in parallel with the known resistance.

B

The ammeter is connected in series in the circuit.

D

There is a sliding contact on the coil which is used to change the value of resistance.

In the electrical setup for verification of ohm's law, ammeter is connected in series and voltmeter is connected in parallel. The sliding contact is then moved to change the resistance of the circuit according to the which the current across the ammeter changes. The voltage during the process remains constant.
A rheostat is a device which can provide us with the variable resistance. It means it can increase or decrease the value of resistance in the circuit.