energy Flashcards

1
Q

How many joules are in one kilojoule

A

1000J​

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2
Q

Where do humans get their energy from?​

A

Food​

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3
Q

Name the three forms of potential (stored) energy.​

A

Gravitational, elastic and chemical​

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4
Q

What is kinetic energy?​

A

Moving

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5
Q

Write out the law of conservation of energy.​

A

Energy cannot be created or destroyed it can only be changed from one form to another​

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6
Q

What is a transducer?​

A

A device that converts energy from one form to another​

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7
Q

Write out the equation for percentage efficiency.​

A

Percentage efficiency = useful energy output /total energy input x 100​

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8
Q

Calculate the percentage efficiency. A light bulb uses 400J of electrical energy and converts 250J into light energy and 150J into heat energy.​

A

250 /400 x 100 = 62.5%

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