Why should we talk about energy being 'wasted' not being 'lost'?
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Card 7
Front
In a light, bulb for every 25 joules of energy that are supplied to the bulb, 5 joules are usefully transferred into light energy. What is the efficiency of the bulb?
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Card 8
Front
A machine is adjusted so that if wastes less energy because of friction. What happens to the efficiency of the machine?
