1  Basic Principles

Useful Relationships

Velocity of light in free space = 299 792.458 km/s

Surface area of a sphere = 4πr2

Volume of a sphere = r3

Peak value of sine wave = 1.414 × r.m.s.

e = base to natural logarithms = 2.718 28

SI Prefixes and multiplication factors

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Definitions

Electric current (I). The unit is the ampere (A). One ampere is the current which when flowing in two infinitely long conductors, one metre apart and of negligible cross-section, produces a force between them of 2 × 10 newtons per metre length.

Force (F). Unit the ...

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