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Electrical Power
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• What is the term for the rate of flow of charge around a circuit?
Current
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• What is the term for the "energy transferred per unit charge"?
Voltage (potential difference)
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• What is the unit for resistance in a circuit?
The Ohm
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• What is the unit for current in a circuit?
Amps (A)
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• What colour is the live wire in a plug?
Brown
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• What colour is the neutral wire in a plug
Blue
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• What colour is the earth wire in a plug?
Yellow and green
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• If my PS4 runs with a current of 3A, which fuse should I choose to put in the plug for the PS4: 2A, 4A, 15A?
4A
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• What is the term for the rate of energy transfer?
Power
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• What is the unit of power?
Watt (W)
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• What is the name of the network of cables and transformers that bring electricity to our homes?
The national grid
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• What is the voltage of the UK mains electricity?
230V
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• What is the Ohms law equation?
V = I x R
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• Why is the voltage stepped up to nearly 400 kV whilst the electricity travels across the cables in the national grid.
To reduce energy lost by heating in the cables.
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• Why is the voltage stepped down by a transformer, to 230V before it enters our homes?
Safety.
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• What is the difference between an A.C supply and a D.C supply?
D.C one direction, constant size. A.C changing direction and changing size.
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• What type of supply does a battery produce, A.C or D.C
D.C
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• What type of supply does a coal power station produce, A.C or D.C?
A.C
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• What is the frequency of the UK mains electricity supply (it's an A.C supply)
50Hz
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• Name 3 fossil fuel energy sources, used to generate electricity.
Coal, Oil, Natural gas
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• Which energy source used to generate electricity is non renewable, but not a fossil fuel?
Nuclear
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• Name 3 renewable sources of energy used to generate electricity
wind, wave, solar, geothermal, hydro (gravitational potential energy), bio fuels
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• What is the name given to a material which can not conduct electricity?
An insulator
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• What is the name given to a material that can conduct electricity?
A conductor
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• Will a bird be electrocuted if it sits on a national grid cable?
No, if it is only touching the live wire, it is not completing a circuit so no current flows.
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• Why is it dangerous to tough a live wire and the ground?
A current will flow through you. This can interrupt the rhythm of you heart and cause burns.
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• What is a fuse?
A piece of wire which will melt and break the circuit if too much current is flowing.
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• What is the equation to calculate electrical power?
P = V x I
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• What affect is burning fossil fuels having on the environment?
Release CO2 which is a greenhouse gas - causing climate change
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• Burning fossil fuels releases sulfur oxides, what negative environmental effect is caused by sulfur oxides?
Acid rain
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• Why could a country not only use wind turbines and solar panels to generate its electricity?
It's not always windy and its not always sunny
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• What is the function of a step up transformer?
To increase the voltage of a supply to reduce energy loss in the cables.
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