Energy transfers in a system: Energy: Physics: GCSE (9:1)

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15 Terms

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System

An object or group of objects

<p>An object or group of objects</p>
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Closed system

A system in which there is no net change to the total energy

<p>A system in which there is no net change to the total energy</p>
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Law of conservation of energy

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

<p>Energy can be transferred usefully, stored or dissipated, but cannot be created or destroyed</p>
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Useful energy transfer

When energy is transferred by a device to energy stores we want

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Wasted energy transfer

When energy is transferred by a device to energy stores we don't want

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Dissipate

When energy spreads out and is transferred to energy stores into less useful forms

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Dissipated energy

Energy which is wasted and is usually transferred to the surroundings, causing them to heat up

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Lubricate

When a substance is used to reduce wasted energy transfers by reducing the friction between moving parts

<p>When a substance is used to reduce wasted energy transfers by reducing the friction between moving parts</p>
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Insulate

When a substance is used to reduce wasted energy transfers by reducing the amount of heat that is transferred to the surroundings

<p>When a substance is used to reduce wasted energy transfers by reducing the amount of heat that is transferred to the surroundings</p>
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Thermal conductor

A material that allows charge or heat to pass through it easily

<p>A material that allows charge or heat to pass through it easily</p>
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Thermal insulator

A material that does not allow charge or heat to pass through it easily

<p>A material that does not allow charge or heat to pass through it easily</p>
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Thermal conductivity

The rate of energy transfer by conduction through a material

<p>The rate of energy transfer by conduction through a material</p>
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Conduction

When heat is transferred through a material due to vibrating particles colliding and transferring energy from one particle to another

<p>When heat is transferred through a material due to vibrating particles colliding and transferring energy from one particle to another</p>
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Convection

When heat is transferred through a moving liquid or gas due to differences in densities

<p>When heat is transferred through a moving liquid or gas due to differences in densities</p>
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Radiation

When heat is transferred from a hot object due to the object emitting infrared (heat) radiation

<p>When heat is transferred from a hot object due to the object emitting infrared (heat) radiation</p>