Components connected in a circuit so that the potential difference is the same across each one.
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Payback time
Time taken for something to produce savings to match how much it cost.
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Perpendicular
At right angles.
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Pitch
The pitch of a sound increases if the frequency of the sound waves increases.
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Pivot
The point about which an object turns when acted on by a force that makes it turn.
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Plane mirror
A flat mirror.
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Potential difference
A measure of the work done or energy transferred to the lamp by each coulomb of charge that passes through it. The unit of potential difference is the volt (V).
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Power
The energy transformed or transferred per second. The unit of power is the watt (W).
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Power of a lens
The focal length of the lens in metres. The unit of lens power is the dioptre (D).
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Pressure
Force per unit area for a force acting on a surface at right angles to the surface. The unit of pressure is the pascal (Pa).
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Principal axis
A straight line that passes along the normal at the centre of each lens surface.
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Principal focus
The point where light rays parallel to the principal axis of a lens are focused (or in the case of a diverging lens appear to diverge from).
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Principle of moments
For an object in equilibrium, the sum of all the clockwise moments about any point = the sum of all the anticlockwise moments about that point.
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Proton
A tiny positive particle found inside the nucleus of an atom.
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Protostar
The concentration of dust clouds and gas in space that forms a star.
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Other cards in this set
Card 2
Front
Payback time
Back
Time taken for something to produce savings to match how much it cost.
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