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Standard Electrical Units of Measure

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The standard units of electrical measurement used for the expression of voltage, current and resistance are the Volt [ V ], Ampere [ A ] and Ohm [ Ω ] respectively.

These electrical units of measurement are based on the International (metric) System, also known as the SI System with other commonly used electrical units being derived from SI base units.

Sometimes in electrical or electronic circuits and systems it is necessary to use multiples or sub-multiples (fractions) of these standard electrical measuring units when the quantities being measured are very large or very small.

Standard Electrical Units of Measure

Electrical Parameter

Measuring

Unit Symbol Description

Voltage Volt V or E Unit of Electrical Potential V = I × R

Current Ampere I or i Unit of Electrical Current I = V ÷ R

Resistance Ohm R or Ω Unit of DC Resistance

R = V ÷ I

Conductance Siemen G or ℧ Reciprocal of Resistance G = 1 ÷ R

Capacitance Farad C Unit of Capacitance

C = Q ÷ V

Charge Coulomb Q Unit of Electrical Charge

Q = C × V

Inductance Henry L or H Unit of Inductance

VL = -L(di/dt)

Power Watts W Unit of Power

P = V × I or I2 × R

Impedance Ohm Z Unit of AC Resistance

Z2 = R2 + X2

Frequency Hertz Hz Unit of Frequency

ƒ = 1 ÷ T

Cytaty

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