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GCSE physics > domestic energy and electricity > Flashcards

domestic energy and electricity Flashcards

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1
Q

what is D.C current?

A

direct current

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2
Q

what does D.C current do?

A

travels in the same direction around a circuit

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3
Q

what provides D.C current?

A

a battery

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4
Q

what is A.C current?

A

alternating current

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5
Q

what does A.C do?

A

current flow is constantly changing direction

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6
Q

what does A.C change between?

A

positive and negative

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7
Q

what does the live wire of a plug do?

A

carry the current/ voltage to appliance at a high voltage

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8
Q

what colour is the live wire?

A

brown

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9
Q

what does the neutral wire do?

A

carries current away at low voltage

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10
Q

what colour is the neutral wire?

A

blue

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11
Q

what does the earth wire do?

A

if live wire breaks, earth wire takes the current safely to ground

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12
Q

what colour is the earth wire?

A

green/ yellow

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13
Q

what is a fuse?

A

thin piece of wire which overheats and melts when a current of more than a certain value flows

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14
Q

how do you choose which fuse to put in the plug?

A

use c = p over v to find the rating and choose the fuse rating which is above that

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15
Q

what is an MCB?

A

miniature circuit breaker

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16
Q

what does an MCB do?

A

breaks the circuit if current goes above certain amount

17
Q

what are the advantages of an MCB?

A

faster and resettable

18
Q

what is an RCCB?

A

residual current circuit breaker

19
Q

what does the RCCB do?

A

breaks the circuit

20
Q

what are the advantages of an RCCB?

A

protects the user

21
Q

what is the ring main circuit?

A

the wiring that connects appliances together in parallel

22
Q

what are the advantages of using a ring circuit?

A

cables made thinner because there are two paths for the current
each part of the cable carries less current because it flows two ways
more convenient since sockets can be placed anywhere on the ring
individual operation of sockets

GCSE physics (8 decks)

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