Delmar's Unit 15

Question 1

Most of the electric power generated in the world is what?

Answer 1

AC

Question 2

Can DC power be transformed?

Answer 2

No

Question 3

What is the most common AC waveform?

Answer 3

A sine wave

Question 4

What is the number of complete cycles in a second called?

Answer 4

frequency

Question 5

How are sine waves produced?

Answer 5

By rotating machines

Question 6

How is frequency measured?

Answer 6

in hertz

Question 7

The instantaneous voltage at any point on a sine wave is equal to what?

Answer 7

The peak voltage times the sine of the angle of rotation

Question 8

The peak-to-peak voltage is the amount of voltage measured from the ___________ to the __________ ?

Answer 8

positive-most peak, negative-most peak

Question 9

What is the RMS value of voltage is equal to what?

Answer 9

A like amount of DC voltage

Question 10

Watts can only be produced when current and voltage are?

Answer 10

both positive or both negative

Question 11

What are the three basic types of AC loads?

Answer 11

resistive, inductive, and capacitive

Question 12

How is the instantaneous voltage at any point on a sine wave calculated?

Answer 12

the peak voltage times the sine of the angle of rotation