Units

Units

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Units

All units are spelled out using lower case, e.g. joules, volts, kilogram.
Symbols of unitsthat derive from the name of a physicist are all uppercase e.g. J, V etc. while symbols for all other units remain lowercase, e.g. the symbol for the kilogram is kg.

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Mechanics

 Quantity Symbol Unit Symbol Equation Area a metres squared m2 Volume v metres cubed m3 Mass m kilogram kg Density r kilogram per metre cubed kg m-3 r = m/v Displacement s metre m Velocity v metre per second m s-1 v = d/t Acceleration a metre per second squared m s-2 Force f newton N F = ma Momentum r kg m s-1 r = mv Pressure p pascal Pa p = F/a Moment of a force newton metre N m Torque (couple) T newton metre N m T = F x d Energy E / Q / W joule J Work W joule J W = F s Power P Watt W P = W/t Angle q (“theta”) radian rad Angular velocity w (“omega”) radian per second rad/sec w = q/t

Heat and Temperature

 Quantity Symbol Unit Symbol Equation Heat Capacity C joule per kelvin J/K Q = c (rq) Specific Heat Capacity c J/kg/K Q = mcrq Latent Heat l joule per kilogram J/kg Q = ml

Waves, Sound and Light

 Quantity Symbol Unit Symbol Equation Frequency f hertz Hz Wavelength l (“lamda”) metres m Velocity v (or c for light) metre per second m/s v = f l Intensity I watts per metre squared W/m2 S.I. = P/A Sound Intensity Level decibels dB

Electricity

 Quantity Symbol Unit Symbol Equation Charge Q coulomb C Electric Field Strength E newtons per coulomb N/C E = F/Q Potential Difference (“voltage”) V volts V W = V Q Capacitance C farads F C = Q/V Current I amperes (amps) A I = Q/t Power P watt W P = VI Resistance R ohm Ω R = V/I Resistivity r ohm-metre Ω m r = RA /l Magnetic Flux Density B tesla T F = BIL Magnetic Flux f Psi (“sigh”) weber W f = BA Half-Life T1/2 second T1/2  = 0.693/l

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Units

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Units

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