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physics > electricity in the home > Flashcards

electricity in the home Flashcards

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1
Q

what is the frequency of mains electricity in the yk

A

50 Hz

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2
Q

what is the voltage of mails electricity in the yk

A

230V

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3
Q

what colour is the live wire

A

brown

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4
Q

what colour is the neutral wire

A

blue

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5
Q

what colour is the earth wite

A

green and yellow stripes

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6
Q

what does the live wire do

A

carries alternating potential difference from the supply

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7
Q

what does the neutral wire do

A

completed the circuit

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8
Q

what does the earth wire do

A

safety wite to stop alliance becoming live

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9
Q

what is the potential fifference between the earth wire and the love wire

A

230 V

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10
Q

what is the potential difference pf earth wire

A

0

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11
Q

what is the potential difference of the neutral wire

A

0

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12
Q

when does the live wire carry the current

A

when there is a fault

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13
Q

what is the equation that links current, power and resistance

A

power= potential difference x current

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14
Q

what is the equation thag links current power and resistance

A

power=(current)squared x resistance

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15
Q

what is the symbol for power

A

P

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16
Q

what is the unit for power

A

Watts W

17
Q

what is the symbol for potential difference

A

V

18
Q

what is the unit for potential difference

A

Volts V

19
Q

what is the sumbol for current

A

I

20
Q

what is the unit for current

A

Amperes, A

21
Q

what is the symbol for resistance

A

R

22
Q

what is the unit for resistance

A

Ohms

23
Q

whay does the amount of energy an appliance transfers depend on

A

the power of the appliance and how long it is switched on for

24
Q

when is work done in a circuit

A

when charge flows

25
Q

what is the equation that links energy transferred, power and time

A

energy= power transferred x time

26
Q

what is the equation that links charge flow, energy transferred and potential difference

A

energy transferred= charge flow x potential difference

27
Q

what is the unit for energy transferred

A

Joules J

28
Q

what is the unit for time

A

seconds S

29
Q

what is the unit for charge flow

A

coloumbs C

30
Q

what is the national grid

A

a system of cables and transformers linking powrt stations to consumers

31
Q

what do step up transformers do

A

increase the potential difference from the power station to transmission cables

32
Q

what do step down transformers do

A

decrease the potential diffefence for domestic use

physics (11 decks)

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