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PHYSICS PAPER 1
TOPIC 2 ELECTRICITY
Domestic Uses and Safety
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Cards (16)
Is mains electricity an a.c supply or a d.c supply?
c
supply
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What does a.c. stand for?
Alternating Current
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What does d.c. stand for?
Direct Current
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Define alternating current and direct current.
Alternating current: Changes direction at a specific
frequency
Direct current: One directional current flow
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What is the frequency of the UK mains electricity supply?
50 Hz
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What is the voltage of the UK mains electricity supply?
230V
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How many wires are usually in the cables connecting electrical appliances to the mains?
Three
wires
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Name the wires in the cables connecting electrical appliances to the mains.
Live wire
Neutral wire
Earth wire
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What is the insulation colour used on the Earth wire?
Green and Yellow Stripes
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What is the insulation colour used on the live wire?
Brown
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What is the insulation colour used on the neutral wire?
Blue
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Explain when the Earth wire does and doesn’t carry a current.
No current flows under normal circumstances
Current flows if a
fault
occurs (e.g.,
surge
)
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What potential is the neutral wire at?
0
Volts
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What is the potential difference between the live and earth wires?
230
Volts
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What is the purpose of the neutral wire?
To complete the circuit back to
mains
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For metal appliances, where is the Earth wire connected to and why?
Connected to the metal casing
Prevents electrocution if live wire touches casing
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