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Components and Measurements 5 of 6 << Previous | Index | Next >>
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Electrical Units and Symbols Chart
Electrical quantities and their corresponding units
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QUANTITY SYMBOL UNIT SYMBOL
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capacitance
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C
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farad
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F
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charge
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Q
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coulomb
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C
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conductance
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G
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siemens
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S
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current
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I
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ampere
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A
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energy
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W
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joule
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J
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frequency
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ƒ
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hertz
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Hz
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impedance
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Z
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ohm
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Ω
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inductance
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L
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henry
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H
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power
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P
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watt
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W
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reactance
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X
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ohm
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Ω
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resistance
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R
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ohm
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Ω
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voltage
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V
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volt
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V
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Scientific and Engineering Notations
Scientific notation is used to provide a convenient way of expressing large
and small numbers. A quantity is expressed as a product of a number
between 1 and 10. If the powers of ten is positive the decimal point is moved
to the right. If the powers of ten is negative the decimal point is moved to the
left. See below for examples of scientific notations and powers of ten.
Engineering notation is similar to scientific notation but can have from one to
three digits to the left of the decimal point. The powers of ten exponent must
be a multiple of three. See below for examples of engineering notations.
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POSITIVE & NEGATIVE POWERS OF TEN
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Scientific Notations
Move the decimal point to the right
for a positive exponent, and to the
left for a negative exponent.
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6
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-6
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5
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-5
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4
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-4
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3
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-3
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2
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-2
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1
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-1
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10
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0
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= 1
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Engineering Notations
Exponent must be a multiple of three
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Click Hear To Goto The Next Page - Metric Prefixes
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