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

What describes muscle power in lifting weights?

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

How do you calculate efficiency using power?

Which is a common device used to lift heavy objects by transferring electrical to gravitational energy?

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

Which power rating is suitable for a railway engine?

What is the equivalent of 1 kilowatt in watts?

What type of energy is usually produced as wasted power in motors?

What type of device typically converts energy transfer faster?

A microwave transfers 120,000 joules in 60 seconds. What is its power rating?

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