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1. Potential difference is the work done to move a charge from one point to another.
2. A potential difference of 1 V refers to
a 1 joule of work done to transport a unit positive charge from one point to another.
3. Work done = 250 joules
Charge transported = 20 C
therefore the potential difference
= 250/20
= 12.5 V
4. A voltmeter is a device to measure the potential difference across 2 points in a circuit.
It is connected in parallel to the circuit.
(See the diagram)
5. A voltmeter has very high resistance.
This is done to prevent drawing of current from the main circuit.
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