Useful energy transferred by a device ÷ total energy supplied to the device.
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Effort
The force applied to a device used to raise a weight or shift an object.
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Elastic
A material is elastic if it is able to regain its shape after it has been squashed or stretched.
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Elastic potential energy
Energy stored in an elastic object when work is done to change its shape.
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Electrical appliance
Machine powered by electricity.
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Electrical energy
Energy transferred by the movement of electrical charge.
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Electromagnetic induction
The process of inducing a potential difference in a wire by moving the wire so it cuts across the lines of force of a magnetic field.
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Electromagnetic spectrum
A set of radiation that have different wavelengths and frequencies but all travel at the same speed in a vacuum.
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Electromagnetic wave
Electric and magnetic disturbance that transfers energy from one place to another. Spectrum of electromagnetic waves in order of increasing wavelength: gamma and X-rays/ultraviolet radiation/visible light/infrared radiation/microwaves/radio waves.
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Electron
A tiny particle with a negative charge that orbits the nucleus in atoms or ions.
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Emit
Give out radiation.
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Emitter
A substance that gives out radiation.
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Endoscope
Optical device used by a surgeon to see inside the body. The device contains two bundles of flexible optical fibres, one used to transmit light into the body and the other used to see inside the body.
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Energy transfer
Movement of energy from one place to another or one form to another.
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Equilibrium
The state of an object when it is at rest.
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Evaporation
Turning from liquid into vapour.
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Other cards in this set
Card 2
Front
Efficiency
Back
Useful energy transferred by a device ÷ total energy supplied to the device.
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