1
Q
if current in a circuit changes polarity continuously, we call this ___________ current.
A
alternating (AC)
2
Q
what is the standard line frequency used in north america?
A
60 Hertz
3
Q
with single phase power, we deal with one voltage source. How many voltages are we dealing with in a 3 phase source?
A
3 voltage sources 120 degrees apart
4
Q
what is the ohms law triangle?
A
E (voltage) / I (amps) X R (ohms)
5
Q
what are some protective devices in electrical and industrial control systems?
A
fuses, circuit breakers, heaters, surge protectors, GFI
4th Year Millwright
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