1.9 Energy And Power (GCSE Physics)

The following is a GCSE Physics test covering '1.9 Energy And Power'

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Question 1

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If 10,000 joules of energy is transferred by a motor in 10 seconds, what’s the power?

A machine has 300 W input power and 100 W of useful output. How much power is wasted?

What is the unit of energy transferred commonly used with power ratings?

Which formula is correct to calculate power?

What is the equivalent of 1 kilowatt in watts?

An electric bulb is 15% efficient. If the input power is 100 W, what’s the useful power?

What does 1 watt equal to in terms of joules and seconds?

Which energy transfer is involved when a bulb lights up?

How do you calculate efficiency using power?

What affects the efficiency of an appliance?

What does wasted power mean?

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