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Physics GCSE - P2 > P2.4 - Using mains electricity and the power of electrical appliances > Flashcards

P2.4 - Using mains electricity and the power of electrical appliances Flashcards

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1
Q

What is direct current?

A

Current that always flows in the same direction, supplied by cells and batteries

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2
Q

What is alternating current?

A

One which is constantly changing direction

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3
Q

What is the frequency of mains electricity?

A

50Hz

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4
Q

What is the voltage of mains electricity?

A

230V

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5
Q

What are most electrical appliances connected to the mains using?

A

A three-pin plug

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6
Q

What are the three wires in an electrical cable?

A
  • Earth (Green and Yellow)
  • Neutral (Blue)
  • Live (Brown)
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7
Q

What is the function of the Earth wire?

A

A safety wire to stop the appliance becoming live

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8
Q

What is the function of the Neutral wire?

A

Completes the circuit

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9
Q

What is the function of the Live wire?

A

Carries the high voltage

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10
Q

Which way does each wire go in a plug?

A

bLue goes Left
bRown goes Right
sTriped goes Top

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11
Q

What is the difference between a two core cable and a three core cable?

A

A two core cable does not have an earth wire

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12
Q

What materials are used to make three-pin plugs?

A
  • Copper for the wires - it is a good electrical conductor

- Plastic for the plug outer - plastic is a good insulator

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13
Q

What happens if an electrical fault causes too great a current?

A

The circuit is disconnected by a fuse or circuit breaker in the live wire

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14
Q

What happens when the current in a fuse wire exceeds the rating of the fuse?

A

It will melt, breaking the circuit

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15
Q

What are RCCBs?

A

Residual Current Circuit Breakers

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16
Q

How do RCCBs operate?

A

By detecting a difference in the current between the live and neutral wires. They operate much faster than a fuse

17
Q

Appliances with metal cases are usually…

A

…earthed

18
Q

When are appliances not earthed?

A

When they are double insulated

19
Q

What protects the wiring of a circuit?

A

The earth wire and fuse

20
Q

When an electrical charge flows through a resistor, what happens?

A

It gets hot

Physics GCSE - P2 (6 decks)

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