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Physics GCSE > p5 > Flashcards

p5 Flashcards

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1
Q

what is direct current

A

current that passes round the circuit in one direction only

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2
Q

what is alternating current

A

current from the mains supply repeatedly reverses direction in. a circuit

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3
Q

what is the frequency of the uk mains supply

A

50Hz which means that the current reverses itself 50 times each second

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4
Q

what is the equation for alternating frequency

A

1 / time taken for one cycle

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5
Q

how does the mains supply alternate its current

A

a live wire alternates between a positive and negative p[otential difference.

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6
Q

how many volts does the live wire alternate between

A

-325V and 325V

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7
Q

what is the national grid

A

a system of cables and transformers linking power stations to consumers

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8
Q

what is a step up transformer

A

used to increase the p.d from the power station to transmission cables

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9
Q

what is a step down transformer

A

used to decrease p.d to a much lower value for domestic use

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10
Q

what is the outer cover of a three pin plug made from

A

stiff plastic material that is a good insulator

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11
Q

what are the pins of the plug made from

A

brass as its a good electrical conductor and is hard and will not rust or oxidise

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12
Q

what is the earth wire ( tree and yellow ) connected to

A

earth pin

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13
Q

what is the live wire ( brown ) connected to

A

live pin

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14
Q

what is the neutral wire ( blue ) connected to

A

neutral pin

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15
Q

what are the outer coverings of the wire made of

A

flexible plastic material

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16
Q

why is the outer coverings of a wire made of flexible plastic wire

A

it is a good insulator and can be bent

17
Q

what does a fuse do

A

if the current in the fuse becomes too big, it will melt and cut of current to the live wire

18
Q

why must appliances with a metal case be earthed

A

the case is attached to the earth wire in the cable, which stops the metal case becoming live if the wire breaks.

19
Q

why are somer cables thicker than others

A

the larger the current, the thicker the cable

20
Q
A

Physics GCSE (27 decks)

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