Appendix A: SI Units and Quantities

Chapter Appendix A: SI Units and Quantities

Fundamental Electrical and Electronic Principles Third Edition Book
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Summary of Contents

Fundamental Electrical and Electronic Principles Third Edition Book

  • 283 Physical Quantities with SI and other preferred units General quantities Symbol Units Acceleration, linear a m/s 2 (metre/second/second) Area A m 2 (square metre) Energy or work W J (joule) Force F N (newton) Length l m (metre) Mass m kg (kilogram) Power P W (watt) Pressure p Pa (pascal) Temperature value K or °C (Kelvin or degree Celsius) Time t s (second) Torque T Nm (newton metre) Velocity, angular rad/s (radian/second) Velocity, linear v or u m/s (metre/second) Volume V m 3 (cubic metre) Wavelength m metre Appendix A Electrical quantities Symbol Units Admittance Y (ohm) Charge (quantity) Q C (coulomb) Conductance G S (siemen) Current I A (ampere) Current density J A/m 2 (ampere/square metre) Electromotive force (emf) E V (volts) Frequency f Hz (hertz) Impedance Z (ohm) Period T s (second) Potential difference (p.d.) V V (volt) Power, active P W (watt) Power, apparent S VA (volt ampere) Power, reactive Q VAr (volt ampere reactive) Reactance X (ohm) Resistance R (ohm) Resistivity m (ohm metre) Time constant s (second)