NCCER Electrical Level 2 Mod 2 Alternating Current Section Three Power in AC Circuits Quiz

Which of the following is true regarding reactive power?

Reactive power performs no work.

The power factor of a circuit with a resistance of 75 ohms and an impedance of 150 ohms is __________

0.50

The apparent power is the result of the vector addition of the true power and the __________.

reactive power

True power is the product of the resistor current squared and the ___________.

resistance

Apparent power is the product of the source voltage and the __________.

current

The true power in a circuit with 4A through a 50Ω resistor is _____.

800

The power factor in a circuit with a resistance of 50Ω and an impedance of 100Ω is _____.

0.5

A power factor is not an angular measure, but a numerical ratio with a value between 0 and 1, equal to the _____.

Group of answer choices

cosine of the phase angle

Apparent power is the product of the source __________ and the __________.

true,apparent

True power is measured in __________.

watts

VAR is the unit of measurement for __________ power.

reactive

The power consumed by __________ is called true power.

resistance

According to the power triangle, the apparent power is _____.

Group of answer choices

Greater

Reactive power is the portion of apparent power that is caused by __________ and __________ in the circuit.

inductors,capitators

What is the true power in a 2A series RL circuit with a 100Ω resistor?

400W

The power factor can be defined as the ratio of true power to _____.

apparent power

The product of the source voltage and the total current is _____.

apparent power

Reactive power is always _____.

90° out of phase with true power