Physics 1A - Energy: Efficiency of Machines & The Cost of Electricity

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What is the formula for efficiency?
Efficiency = Useful Energy Out / Total Energy In
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How do you figure out efficiency if you don't know the energy in and out of the device?
Efficiency = Useful Power Out / Total Power In
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Can a device be 100% efficient?
No device is 100% efficient and the wasted energy is usually spread out as heat.
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What is the formula for energy transferred?
Power x Time.
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1 Kilowatt-Hour is...
...the amount of electrical energy used by a 1kW appliance left on for 1 hour.
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What is the formula for cost of energy?
Cost = Energy Transferred (kWh) x Price per kWh.
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Card 2

Front

How do you figure out efficiency if you don't know the energy in and out of the device?

Back

Efficiency = Useful Power Out / Total Power In

Card 3

Front

Can a device be 100% efficient?

Back

Preview of the front of card 3

Card 4

Front

What is the formula for energy transferred?

Back

Preview of the front of card 4

Card 5

Front

1 Kilowatt-Hour is...

Back

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