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science revision ass 2 > physics knowldege questions > Flashcards

physics knowldege questions Flashcards

1
Q

What does DC stand for?

A

direct current

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2
Q

What does AC stand for?

A

alternating current

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3
Q

Is UK mains electricity AC or DC?

A

alternating current

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4
Q

What Potential difference is UK mains electricity?

A

230 V

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5
Q

What frequency is UK mains electricity?

A

50 Hz

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6
Q

What is the name for the device which increases the potential difference in the national grid?

A

step up transformer

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7
Q

What is the name for the device which lowers the potential difference in the national grid?

A

step down transformer

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8
Q

What is the name for the whole system (cables, step up transformers and step down transformers) that ensure electricity gets around the country?

A

the national grid

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9
Q

What is the name for the brown wire in a mains plug, which has the high Potential difference?

A

live wire

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10
Q

What is the name for the blue wire in a mains plug, which completes the circuit?

A

neutral wire

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11
Q

What is the name for the green and yellow wire in a mains plug that is used for safety?

A

earth wire

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12
Q

What is the unit of potential difference?

A

Volt (V)

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13
Q

What is the unit of current?

A

Amps (A)

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14
Q

What is the unit of resistance?

A

Ohm (Ω)

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15
Q

What is the unit of charge?

A

Coulomb (C)

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16
Q

What is the unit of power?

A

Watt (W)

17
Q

What is the unit of time?

A

second (s)

18
Q

What is the unit of energy and work done?

A

Joule (J)

19
Q

Write the equation which links power, time and energy

A

energy= power x time

20
Q

Write the equation which links current resistance and power

A

Power = current2 x resistance

21
Q

Write the equation which links current, power and potential difference

A

Power = current x potential difference

science revision ass 2 (3 decks)

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