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Definitions (277)

1.

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Principle of Reversibility


TC, SP This applies to light rays passing through any system of mirrors or lenses. Basically, it means if a ray of light follows a path when going, say, from left to right, then another ray of light going from right to left will follow the same path in reverse.
Source: users.zetnet.co.uk

2.

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Double Insulation


UE An electrical appliance which is double insulated does not have an earth wire fitted. The appliance is designed in such a way that the electrical parts can never come into contact with the outer casing of the device. Common double insulated appliances are hair dryers, radios and cassette players. A wet double insulated appliance is exceptionall [..]
Source: users.zetnet.co.uk

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Parallel Beam


TC, SP A parallel beam is one which does not diverge or converge - its width stays the same as the wave (which could be light or microwaves for example) travels out from its source. Parallel beams are produced using curved (parabolic) reflector dishes (e.g. in car headlamps, satellite transmitter dishes, mobile phone mast relay dishes). Parallel li [..]
Source: users.zetnet.co.uk

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Yabadabadoo


This is a phrase often uttered by those people who finish reading the zenith entry below, having read the whole of this file. Top Z Zenith SP The zenith is the point in the sky directly above an observer's head. This term is often used in astronomy.
Source: users.zetnet.co.uk

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Alternator


EM This is a device for generating a.c. electricity. It consists of rotor coils (with a d.c. supply) and stator coils which produce the a.c. electricity.
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Amplitude Modulation


TC Amplitude modulation refers to the changing of the amplitude of a radio-frequency or microwave frequency carrier wave. The other method of modulation is called frequency modulation.
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Black Hole


SP A collapsed star from which no light can escape, due to the intense gravitational field.
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Consumer Unit


UE Commonly known as the fusebox, the consumer unit is the part of the meter board which separates the incoming electrical supply into the various lighting and ring main circuits. Each of these circuits is protected by either a fuse or miniature circuit breaker (MCB)
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Drag


TR, SP Drag is a type of friction force usually associated with movement through a fluid like air or water. Drag forces generally increase at high speeds.
Source: users.zetnet.co.uk

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Electron


TC, UE, EL, EM Electrons are sub-atomic particles. They carry a negative electrical charge (qe=-1.602 x 10-19 C). They have a mass of me = 9.110 x 10-31 kg. Beams of electrons are used in TV sets where they are called cathode rays. See also b (beta) radiation.
Source: users.zetnet.co.uk


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