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2018-05-17T20:14:07Z

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it can only be ______________ from one _____ to another.

Energy can only be used when it is transferred from one form to another.

This is called ______.

A light bulb is supplied with a total of 150J of electrical energy.

The bulb gives off 60J of light energy.

Calculate the percentage efficiency of the bulb using the equation:

How much energy

does a 150W light

bulb transfer in:

a) three seconds

b) one minute

A 2,500 W electric heater is switched on for 4 hours.

Calculate the energy used

in that time and the cost of using the appliance if

1 unit costs 9 pence.

A 200W TV is used for an average of 3 hours each day.

Calculate how much the TV costs to run per week.

Cost of 1 unit =

10 pence.

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