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GLOSSARY
�-connected ac generator A three-phase generator having
the three phases connected in the shape of the capital Greek
letter delta (D).
Line current The current that flows from the generator to the
load of a single-phase or polyphase system.
Line voltage The potential difference that exists between the
lines of a single-phase or polyphase system.
Neutral connection The connection between the generator
and the load that, under balanced conditions, will have zero
current associated with it.
Phase current The current that flows through each phase of
a single-phase or polyphase generator load.
Phase sequence The order in which the generated sinusoidal
voltages of a polyphase generator will affect the load to
which they are applied.
Phase voltage The voltage that appears between the line and
neutral of a Y-connected generator and from line to line in
a D-connected generator.
Polyphase ac generator An electromechanical source of ac
power that generates more than one sinusoidal voltage per
GLOSSARY ⏐⏐⏐ 1015
rotation of the rotor. The frequency generated is determined
by the speed of rotation and the number of poles of the
rotor.
Single-phase ac generator An electromechanical source of
ac power that generates a single sinusoidal voltage having a
frequency determined by the speed of rotation and the number
of poles of the rotor.
Three-wattmeter method A method for determining the
total power delivered to a three-phase load using three
wattmeters.
Two-wattmeter method A method for determining the total
power delivered to a D- or Y-connected three-phase load
using only two wattmeters and considering the power factor
of the load.
Unbalanced polyphase load A load not having the same
impedance in each phase.
Y-connected three-phase generator A three-phase source
of ac power in which the three phases are connected in the
shape of the letter Y.