Direct current- current that always flows in the same direction (supplied by cells and batteries)
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What is a.c. current?
Alternating current- current that is constantly changing direction
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Mains Electricity?
Mains Electricity is an a.c. supply, in the UK it has a frequency of 50 cycles per second (50Hz) and is about 230 V
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What can be used in half wave rectification of an a.c current?
A diode
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How are most electrical appliances connected to mains electricity?
Using a cable and a 3-pin plug
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What disconnects the appliance if the current is too great?
A fuse in the live wire disconnects the circuit if the current is too great
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What is a RCCB?
A residual current circuit breaker is a device that breaks a circuit like a fuse but doesn't need to be replaced, as it is more like a button that will pop out if the circuit's current exceeds safe quantities
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What happens to appliances with metal casing?
They are earthed
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What protects the wiring of a circuit?
The earth wire and the fuse
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Other cards in this set
Card 2
Front
What is a.c. current?
Back
Alternating current- current that is constantly changing direction
Card 3
Front
Mains Electricity?
Back
Card 4
Front
What can be used in half wave rectification of an a.c current?
Back
Card 5
Front
How are most electrical appliances connected to mains electricity?
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