Energy stores, energy transfer + work done

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15 Terms

1
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What are the energy stores?

Chemical, thermal, kinetic, gravitational potential energy, elastic potential energy, magnetic, electrostatic and nuclear.

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Chemical energy store

Energy due to the bonds between particles, stored in food, batteries and fuels

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Thermal energy store

Filled when an object is warmed up.

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Kinetic energy store

Moving objects

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Gravitational potential energy

Objects gain energy in their GPE when they are lifted through a gravitational field

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Elastic energy store

Filled when a material is stretched or compressed.

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Magnetic energy store

Magnets that are attracting or repelling

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Electrostatic energy store

Objects with charge (like electrons and protons) interacting with one another have energy in their electrostatic store

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Nuclear energy store

Atomic nuclei release energy from this store in nuclear reactions

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What are the energy transfers?

Mechanically, electrically, by heating, by radiation (light and sound)

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What is the law of conservation of energy?

Energy can't be created or destroyed but it may change form and the total amount stays the same.

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What is energy measured in?

Joules (J)

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What is the equation for efficiency?

Efficiency = (useful energy output/total energy input) x 100

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What is the equation for work done?

Work done (J) = force (N) x distance moved (m)

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What is work done equal to?

Energy transferred