# Physics (P1) - Using Energy

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• Created by: Roma
• Created on: 12-12-13 21:30
What are three types of stored energy?
GPE, elastic potential and chemical energy.
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What energy transfers take place in a falling object?
GPE --> kinetic energy.
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What is the conservation of energy?
Energy can never be destroyed, but only transformed from one to another, or from one place to another. The total amount of energy is always the same.
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What energy do we get out of a machine?
Useful - energy transferred to the place we want, in the form we want. Wasted - energy which is not usefully transferred.
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What eventually happens to the energy out of a machine?
It is transferred to the surroundings and make them warm up. As the energy spreads, it becomes more difficult to use it for further energy transfers.
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Why is energy often wasted?
Due to friction between moving parts. This warms the machine and the surroundings.
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How can friction be useful?
E.g. the brakes on a bike. Some of the kinetic energy is transferred to energy heating the brakes.
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What is the energy supplied to a machine?
Input energy (joules, j,)
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What one appliance can be 100% efficient?
An electric heater - all of the energy is usefully transferred to heat the surroundings.
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How can energy transfer through an appliance be represented.
Sankey Diagram.
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## Other cards in this set

### Card 2

#### Front

What energy transfers take place in a falling object?

#### Back

GPE --> kinetic energy.

### Card 3

#### Front

What is the conservation of energy?

### Card 4

#### Front

What energy do we get out of a machine?

### Card 5

#### Front

What eventually happens to the energy out of a machine?