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Electrical Power

Electrical Power = V Isopower = potential difference × current.so electrical energyis

E = V I t

potential difference x current × time(because energy = power × time)The energy supplied to a 12V light bulb can be measured by a joule meter whilst the light bulb is switched on.The power supplied to the light bulb is given by:energy supplied ÷ time taken.

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Specification: AQA Physics (7407), AS-level, 3.4.1.7 Work, energy and power. Topic: Work, Energy and Power.

Key terms in this lesson

Tensile stress
The force applied to a material divided by its cross-sectional area.
Tensile strain
The extension of a material divided by its original length; it has no units.

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