Energy Flashcards

1
Q

What is energy

A

Energy is the abiity to do work

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2
Q

What is the unit for energy

A

Joules (j)

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3
Q

Name 6 types of energy

A

Poential,kinetic,chemical,light,heat,electrical,sound,nuclear

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4
Q

What is the principle of conservation of energy

A

Energy cannot be created or destroyed but only changed from one form to another

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5
Q

What is energy effinceny

A

Energy efficency means using the least amount of energy to do a task

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6
Q

How to calculate work done

A

Force x distance

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7
Q

What affects work

A

The mass and the distance

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8
Q

What type of energy would be in food

A

Chemical energy

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9
Q

What is energy dissipation and give an example

A

Energy dissipation is when energy changes from a useful form to a not so useful form
EG: When a car brakes, its movement energy turns into heat due to friction.

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10
Q

Describe kinetic energy

A

Energy that a body has because it is moving EG: a ball rolling on the ground

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11
Q

Describe potential energy

A

Energy that a body has because of its relative to other bodies

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12
Q

Describe sound energy

A

Energy that is produced by a vibration

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13
Q

Describe chemical energy

A

Energy that is stored in food

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14
Q

Describe electrical energy

A

Energy that comes from the flow of electric charge

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15
Q

Describe solar energy

A

Energy that comes from the sun

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16
Q

How to calculate efficency of a device

A

Eg: lamp
electrical in=40J
Light out= 0.8J
0.8 X 100 = 2%
___ ___
40 1

17
Q

What is the unit for power

18
Q

Define power

A

Power is the rate at which work is done.