Energy and efficiency Flashcards

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1
Q

What are the nine types of energy?

A

Electrical, light, sound, kinetic, nuclear, thermal, gravitational potential, elastical potential, chemical

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2
Q

Which forms of energy are stored?

A

Chemical, gravitational and elastical

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3
Q

What is the law of conservation?

A

Energy can never be created or destroyed, just transferred or dissipated

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4
Q

What is efficiency?

A

How good a device is at doing its job

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5
Q

What happens to wasted energy?

A

It dissipates into the surroundings

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6
Q

No device can ever be…

A

100% efficient

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7
Q

What form of energy is wasted energy usually?

A

Heat

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8
Q

What units is the energy = power x time in?

A

kwh = kw x h

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9
Q

How do you work out the cost of running an appliance?

A

Number of units = power x time

Cost = number of units x cost for 1 unit

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