14 Electrical Power Systems Technology
Table 1-7. Common Units
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Quantity SI Unit Symbol
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Angle radian (1 rad ≅ 57.3°) rad
Area square meter m^2
Capacitance farad F
Conductance siemens (mhos) S
Electric charge coulomb C
Electric current ampere A
Energy (work) joule J
Force newton N
Frequency hertz Hz
Heat joule J
Inductance henry H
Length meter m
Magnetic field strength ampere per meter A/m
Magnetic flux weber Wb
Magnetic flux density tesla (1 T = 1 Wb/m^2 ) T
Magnetomotive force ampere A
Mass kilogram kg
Potential difference volt V
Power watt W
Pressure pascal (1 Pa = 1 N/m2) Pa
Resistance ohm Ω
Resistivity ohm-meter Ωm
Specific heat joule per kilogram-kelvin J/kg K or J/kg = °C
Speed meter per second m/s
Speed of rotation radian per second (1 rad/sec = 9.55 r/min) rad/s
Temperature kelvin K
Temperature difference kelvin or degree Celsius K or °C
Thermal conductivity watt per meter-kelvin W/m K/or W/m= °C
Thermal power watt W
Torque newton-meter N-m
Volume cubic meter m^3
Volume liter L
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