The lights in a school laboratory have a total power of 600 W and are left on for 7.0 hours each day. In order to reduce fuel bills, it is decided to have the lights switched on only when there are people in the laboratory. This amounts to a total time of 4.5 hours per day. Assuming that the laboratory is used for 200 days each year, calculate the saving, if 1 kW h of energy costs 7.0 cents.
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work done = force × distance moved by the force in the direction of the force ... a school laboratory have a total power of 600 W and are left on for 7.0 hours each day.
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