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Glossary
Electrical Theory & Applications for HVACR
line
conductors carrying power from the generaƟng source
load center
point from which branch circuits originate
locked rotor amps (LRA)
steady state current drawn by a motor when the rotor is locked to prevent its movement
lockout (safety)
the opening and locking of the main power switch to safely perform service procedures
lugs
terminals on the end of a wire or places on equipment to facilitate connecƟons
M
magneƟc field
lines of force that extend from a north polarity and return to a south polarity to form a loop around a
magnet
magneƟc flux
lines of force that connect the north and south poles of a magnet
main
the primary circuit supplying all other circuits
make
to complete a circuit by closing a switch
meg‐ (or mega‐)
prefix meaning one million
mho
unit of electrical conducƟvity of a body with a resistance of one ohm (reciprocal of ohm)
megohm
unit of resistance equal to one million ohms
micro‐
prefix meaning one millionth
microfarad (mfd)
one millionth of a farad
milli–
prefix meaning one thousandth