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Physics revision questions. Mains electricity.

Summary questions:

1. In a mains circuit which wire:
a. Is earthed at the local substation?
b. Alternates in potential?
2. An oscilloscope is used to display the potential difference of an alternating voltage supply current.
How would the trace change if:
a. The potential…

Page 2

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Physics revision questions. Mains electricity.

a. What is the power of the heater? (2 marks)
b. The heater is switched on for 30 minutes. Calculate how much charge flows through the heater
during this time and give the unit.
2. State and explain why parts of the plug are made…

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