If a machine wastes less energy, what would the machine be deemed to be?
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Card 7
Front
What equation can we use to calculate the efficiency of any appliance that transfers energy?
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Card 8
Front
How can the efficiency be shown?
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Card 9
Front
How is an electric heater different from all other appliances in relation to energy efficiency?
Back
Card 10
Front
How can the energy transfer through an appliance be represented?
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Card 11
Front
What do the measures to make machines more efficient include?
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Card 12
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?
Back
Card 13
Front
A machine is adjusted so that it wastes less energy because of friction. What happens to the efficiency of the machine?
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Card 14
Front
No appliance can be more than 100% efficient therefore what should an efficiency calculation never be more than?
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Card 15
Front
Efficiency is a ratio, therefore what doesn't it have?
