Power Relationships

Question 1

The property of an electric circuit that coverts electric energy into heat energy is called:

A) resistance
B) inductance
C) capacitance
D) impedance

Answer 1

A) resistance

Question 2

Power may be defined as:

A) the ability to do work
B) a rate of doing work
C) stored work
D) force x distance
E) more than one of the above

Answer 2

B) a rate of doing work

Question 3

The inductive reactance of an electric circuit is capable of dissipating energy.

True or False?

Answer 3

False

Question 4

A coil (which has the properties of resistance and inductance) has the ability to both store energy and to dissipate energy.

True or False

Answer 4

True

Question 5

It is common practice when drawing a power triangle to let the horizontal side represent the true power of the circuit.

True or False?

Answer 5

True

Question 6

Reactive power can be defined as the rate at which energy is stored and returned to a circuit.

True or False

Answer 6

True

Question 7

Reactive voltage = reactive power/reactive current

True or False?

Answer 7

True

Question 8

Which of the three circuit properties are associated with reactive power?

Answer 8

Capacitance and Inductance

Question 9

Which of the three circuit properties are associated with power?

Answer 9

Resistance

Question 10

Describe reactive power due to inductance.

Answer 10

Stores energy in the electromagnetic field

Question 11

Describe power due to capacitance.

Answer 11

Stores energy in the electrostatic field

Question 12

The product of current times voltage can always be called:

A) power
B) reactive power
C) apparent power
D) watts

Answer 12

C) apparent power

Question 13

Define the term power factor.

Answer 13

The ratio between power and apparent power

Question 14

Define the term phase angle.

Answer 14

The angle between the power (P) and the apparent power (S) on a power triangle.