Power Relationships

Question 1

Reactive power is

Answer 1

The rate at which energy is stored and returned to a circuit.

Question 2

The symbol for reactive power is

Answer 2

Q

Question 3

Unit of measurement for reactive power is

Answer 3

var

Volt Amp Reactive

Question 4

Reactive voltage =

Answer 4

Reactive power / Reactive current

Question 5

What 2 properties are associated with reactive power

Answer 5

Capacitance and inductance

Question 6

What property is associated with power?

Answer 6

Resistance

Question 7

What is reactive power due to inductance?

Answer 7

Reactive power due to inductance stores energy in the electromagnetic field.

Question 8

What is reactive power due to capacitance?

Answer 8

Reactive power due to inductance stores energy in the electrostatic field.

Question 9

Apparent power =

Answer 9

Voltage x Current

Question 10

The symbol for apparent power is

Answer 10

S

Question 11

Unit of measurement for apparent power is

Answer 11

va

Volt Ampere

Question 12

What is the formula for power factor

Answer 12

pf = P / S

Question 13

What is the symbol for power?

Answer 13

P

Question 14

A power factor of one is also known as

Answer 14

Unity power factor

Question 15

The formula for power factor is

Answer 15

Cos theta = P / S

Question 16

Define the term power factor

Answer 16

The power factor of a circuit is the ratio between power and apparent power

Question 17

Define the term phase angle and identify its symbol

Answer 17

The phase angle is the angle between power (P) and apparent power (S) on a power triangle. The symbol is theta.

Question 18

Power is measured in ____ and its symbol is ______.

Answer 18

Watts

W