AC Theory Flashcards
1
Q
What does AC stand for?
A
Alternating current
2
Q
What direction does AC travel through a conductor?
A
Both (it alternates)
3
Q
List 2 advantages of AC and DC.
A
Using transformers, it is much easier to supply voltages at different values. Wiring and equipment can be made much lighter.
4
Q
The speed at which AC changes direction is called?
A
Frequency
5
Q
The level to which the voltage or current rises to is called?
A
Amplitude
6
Q
How are AC cycles per second expressed?
A
Hertz
7
Q
What are the values of the ships main electrical supplies?
A
60 hertz, 3 phase, 450 volts
8
Q
What’s the frequency equation.
A
Time (seconds) = 1/frequency
9
Q
What is the units of inductance and the more common values?
A
Milli- henries (mH) and micro-henries
Henry (H)
10
Q
Parts of a sine wave.
A
Positive peak value Time One cycle Peak negative value Amplitude.
