AC Power

Question 1

What does AC stand for?

Answer 1

Alternating current

Question 2

What direction does AC travel through a conductor?

Answer 2

Both, it alternates

Question 3

Name two advantages of AC over DC

Answer 3

Wiring and equipment is lighter

Voltages can be provided at different values easily, using a generator.

Question 4

What is frequency?

Answer 4

The speed at which AC changes direction.

Question 5

What is amplitude?

Answer 5

The level to which the voltage or current rises to.

Question 6

How are AC cycles per second expressed?

Answer 6

In Hertz

Question 7

What are the values of ships main electrical supplies?

Answer 7

450 V, 3 phase, 60 Hertz

Question 8

What is the frequency equation?

Answer 8

Time (seconds) = 1/Frequency

Question 9

What is the unit of inductance? And what are more common values?

Answer 9

Henry
Millihenry (mH)
Microhenry

Question 10

What do transformers do?

Answer 10

Change size of voltage or current without loss of power.

Question 11

What is a disadvantage of DC?

Answer 11

When power is transmitted over long distances, losses occur due to the resistance of the cables and size of the current being carried.

Question 12

What happens when the size of the current is reduced?

Answer 12

The losses are reduced.

Question 13

What is a length of coiled wire called?

Answer 13

Basic inductor.

Question 14

What is a cycle?

Answer 14

The movement in one direction and then the other, a full revolution of a generator.