Example:
During an occasion of lightning, 200C of charge was transferred from the cloud to the surface of the earth and 1.25×1010J of energy was produced. Find the potential difference between the cloud and the surface of the earth.
Answer:
Work done, W = 1.25×1010J
Charge transferred, Q = 200C
Potential difference, V = ?
To use the ammeter in the measurement of an electric current, the ammeter must be connected in series to the circuit.
To use the voltmeter in the measurement of potential difference across an object, the voltmeter must be connected in parallel to the circuit.