Question

Diagrammatically illustrate how you would connect a key, a battery, a voltmeter, an ammeter, an unknown resistance (R) and a rheostat so that it can be used to verify the Ohm’s law.

Answer 1

Connect the battery, key, ammeter, rheostat and unknown resistance (R) in series. Connect the voltmeter in parallel across (R). A schematic is:

Vary the rheostat to obtain different current and voltage readings, then verify that their ratio remains constant.