Electricity 1-7 Ch 4

Question 1

The term phase angle is used to describe the _________ relationship between AC voltages and currents

Answer 1

Time

Question 2

In a purely resistive circuit, what is the phase relationship between I and E?

Answer 2

They are in phase

Question 3

In a purely inductive circuit, what is the phase relationship between I and E?

Answer 3

Voltage leads current by 90°

Question 4

In a purely capacitive circuit, what is the phase relationship between I and E?

Answer 4

Current leads voltage by 90°

Question 5

Quantities that only have magnitude are called what?

Answer 5

Scalars

Question 6

The length of the line is proportional to the ____________ of the vector quantity

Answer 6

Magnitude

Question 7

When vectors added or subtracted, the result is also a vector, called the:

Answer 7

Resultant vector

Question 8

How do you add vector quantities that have the same direction?

Answer 8

Simply add the individual magnitudes

Question 9

How can you add two vectors that are 90° apart?

Answer 9

Graphically, using the triangle method

Question 10

The lengths of the three sides of a right triangle are related by:

Answer 10

The Pythagorean theorem

Question 11

Can the size of an angle be found if you know the sine, cosine, and tangent of an angle?

Answer 11

Yes

Question 12

In resistive circuits, all of the power delivered by the source is dissipated by what?

Answer 12

The load.

Question 13

Apparent vs true power.

Answer 13

True power = useful power; power actually consumed in the curcuit
Apparent power = total power,