Quantities & Units

Here are a selection of quantities that you will have met:

Quantity	Symbol	Unit
mass	m	kilogram, kg
distance	d	metre, m
time	t	second, s
current	I	amp, A
voltage	V	volts, V
resistance	R	ohm,
force	F	newton, N
area	A	square-metre, m²
energy	E or W	joule, J
power	P	watt, W

Use the symbol when writing an equation.

Use the unit when describing how much of something there is.

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