When using something with moving parts, how do you reduce the wasted energy transferred as heat (due to the friction force).
Lubrication (grease, oil etc.)
What is the term for the "energy transferred per unit charge"?
Voltage (potential difference)
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.
What type of supply does a battery produce, A.C or D.C
D.C
When using a TV, which type of transferred energy is being wasted?
Heat
When using a toaster, which type of transferred energy is being wasted?
Light
What colour is the live wire in a plug?
Brown
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
When using a hairdryer, which type of transferred energy is being wasted?
Sound
Which type of power station transfers gravitational potential energy from water?
Hydroelectric
What is the function of a step up transformer?
To increase the voltage of a supply to reduce energy loss in the cables.
Name 3 fossil fuel energy sources, used to generate electricity.
Coal, Oil, Natural gas
Which energy source used to generate electricity is non renewable, but not a fossil fuel?
Nuclear
What is the name given to a material which can not conduct electricity?
An insulator
What is the unit for resistance in a circuit?
The Ohm
What colour is the neutral wire in a plug
Blue
What is a fuse?
A piece of wire which will melt and break the circuit if too much current is flowing.
What is the unit for current in a circuit?
Amps (A)
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
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.
What is the name given to a material that can conduct electricity?
A conductor
Which of the two types of bulb is more efficient?
LED
What is the name of the network of cables and transformers that bring electricity to our homes?
The national grid
Name 3 renewable sources of energy used to generate electricity
wind, wave, solar, geothermal, hydro (gravitational potential energy), bio fuels
What is the frequency of the UK mains electricity supply (it's an A.C supply)
50Hz
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.
What colour is the earth wire in a plug?
Yellow and green
Why is the voltage stepped down by a transformer, to 230V before it enters our homes?
Safety.
Would a plug still work without the earth wire?
Yes, the earth wire is for safety
Which type of power station transfers the energy from naturally hot rocks underground?
Geothermal power station
What affect is burning fossil fuels having on the environment?
Release CO2 which is a greenhouse gas - causing climate change
Why is it dangerous to touch a live wire and the ground?
A current will flow through you. This can interrupt the rhythm of your heart and cause burns.
What is the voltage of the UK mains electricity?
230V
What type of supply does a coal power station produce, A.C or D.C?
A.C
What is the term for the rate of flow of charge around a circuit?
Current
Burning fossil fuels releases sulfur oxides, what negative environmental effect is caused by sulfur oxides?
Acid rain