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Most electricity must be generated from other energy stores, some are renewable but most are non-renewable. The National Grid transfers electrical power in an efficient way.
Which of these features would NOT ensure that the minimum amount of power is lost from the cables which form part of the National Grid?
The cables are thick so that their resistance is low
High voltages are used to reduce the current
The cables are thin so that their weight is low
In an electric kettle, what energy is not wasted?
The energy that heats the water
The energy that dissipates out of the kettle into the surroundings
The sound heard as the kettle boils
What is the efficiency percentage of Christmas lights that give out 10 W of light radiation for an electrical power input of 200 W?
Which of these is not a fossil fuel?
Which gas is linked to global warming?
What does it mean, if an energy resource is renewable?
That it can be recycled
That it can be reused
That it can be replenished
What are nuclear fuels used for?
Which energy resource is the least reliable?
Why does the energy demand in UK households tend to increase between 6 and 9 pm?
During those times most families are all at home using lights, electrical devices and the heating is on
Power stations cost more to run in the evening
Less heating is needed in the evening, but more lighting is used
Which energy resource produces the majority of electricity used globally?
Renewable energy resources