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Definitions (277)

1.

4   6

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 [..]
Source: users.zetnet.co.uk

2.

3   1

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 [..]
Source: users.zetnet.co.uk

3.

1   0

Atom


HP, EL, EM, SP An atom is the smallest possible particle of any chemical element. For example, an atom of carbon is the smallest possible unit of carbon. All of the atoms of an element are identical [..]
Source: users.zetnet.co.uk

4.

1   1

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 c [..]
Source: users.zetnet.co.uk

5.

1   0

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 obse [..]
Source: users.zetnet.co.uk

6.

0   0

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.
Source: users.zetnet.co.uk

7.

0   0

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.
Source: users.zetnet.co.uk

8.

0   0

Black Hole


SP A collapsed star from which no light can escape, due to the intense gravitational field.
Source: users.zetnet.co.uk

9.

0   0

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 circu [..]
Source: users.zetnet.co.uk

10.

0   0

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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