Energy Flashcards

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1
Q

What are the types of energy’s?

A

Kinetic, Heat, Light, Gravitational potential, Chemical, Sound, Electrical, Elastic potential, Nuclear, Internal energy and strain energy.

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2
Q

Kinetic energy

A

The energy is moving objects - also called movement energy.

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3
Q

Heat energy

A

It is also known as thermal energy.

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4
Q

Light energy

A

Also called radiant energy.

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5
Q

Gravitational potential energy

A

Energy stored in raised objects.

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6
Q

Chemical energy

A

Stored energy in fuel, foods and batteries.

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7
Q

Sound energy

A

Energy released by vibrating objects.

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8
Q

Electrical energy

A

Energy in moving charges or static electric charges.

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9
Q

Elastic potential

A

Stored energy in stretched or squashed objects.

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10
Q

Nuclear energy

A

Stored in the nuclei of atoms.

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11
Q

Internal energy

A

Contained in a thermodynamic system.

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12
Q

Strain energy

A

Released when atoms in a molecule rearrange themselves in a chemical reaction.

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13
Q

What is the useful energy transfer in a car engine?

A

Chemical energy, which is stored in the fuel, into kinetic energy in the engine and wheels.

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14
Q

What is the useful energy transfer in a electric lamp?

A

The electric lamp transfers or converts electrical energy into light energy.

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15
Q

What do sankey diagrams do?

A

Sankey diagrams summarise all the energy transfers taking place in a process. The thicker the line or arrow, the greater the amount of energy involved.

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16
Q

What is conservation of energy?

A

Energy can be transferred usefully, stored or dissipated. It cannot be created or destroyed.

17
Q

What happens to the ‘wasted’ energy?

A

This ‘wasted’ energy eventually becomes so spread out that it becomes very difficult to do anything useful with it.

18
Q

How do you calculate the efficiency of a device, such as a lamp?

A

efficiency = useful energy out ÷ total energy in (for a decimal efficiency)
or
efficiency = (useful energy out ÷ total energy in) × 100 (for a percentage efficiency)

19
Q

What is efficiency of a device always less than?

A

100%

20
Q

What can the power be shown in as well as W?

A

Joules (J)

21
Q

How is the efficiency calculated for power?

A

efficiency = useful power out ÷ total power in (for a decimal efficiency)
or
efficiency = (useful power out ÷ total power in) × 100 (for a percentage efficiency)