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Physics > C4 Supplying Electricity > Flashcards

C4 Supplying Electricity Flashcards

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1
Q

Power stations generate electricity with what type of current

A

Alternating

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2
Q

What devices on the national grid are used to increase and decrease potential difference

A

Step up / Step down

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3
Q

What is the maximum voltage of overhead cables on the national grid

A

400,000V

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4
Q

Equation relating power, current and potential difference

A

Power (watts) = current (amps) x potential difference (volts)

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5
Q

Equation relating power, current and resistance

A

Power (watts) = current^2 (amps) x resistance (ohms)

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6
Q

Equation used to work out unknown values on transformers

A

Primary potential difference (Volts) x Primary current (amps) = Secondary potential difference (Volts) x Secondary current (amps)

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7
Q

Equation relating charge flow and time

A

Charge flow (Coulombs) = Current (Amps) x time (Seconds)

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8
Q

Equation relating energy transfer, charge flow and potential difference

A

Energy transferred (Joules) = Charge flow (Coulombs) x Potential Difference (Volts)

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9
Q

Equation relating power, energy and time

A

Power (Watts) = Energy transferred (Joules) / time (seconds)

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10
Q

What is the potential difference supplied to buildings from the national grid

A

230V

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11
Q

What kind of current does a battery/cell supply (AC/DC)

A

Direct Current

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12
Q

What kind of current does a mains power supply, supply (AC/DC)

A

Alternating current

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13
Q

Frequency of the mains electricity in the UK

A

50Hz

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14
Q

Colour of the earth wire

A

Green and yellow striped

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15
Q

Purpose of the earth wire

A

The potential difference of the earth wire is 0V so if there is a fault and the live wire is touching the casing, the earth wire carries its potential difference.

IT PROVIDES AN ALTERNATE PATH OF LEAST RESISTANCE

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16
Q

Colour of the neutral wire

A

Blue

17
Q

Purpose of the neutral wire

A

Completes the circuit with a potential difference of 0V

18
Q

Colour of the live wire

A

Brown

19
Q

Purpose of the live wire

A

High potential difference of 230V causing a large current to flow to the appliance

20
Q

Purpose of the fuse in plugs

A

Fuse connected to the live wire. If the live wire touches the neutral wire (short circuit) a very large current flows. This causes the fuse to melt causing a large current to flow through if you touched it.

Physics (5 decks)

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