Asked by Sarah Bradley on May 17, 2024
Verified
In a three-phase circuit, the true power (watts) is found by _____.
A) multiplying line voltage by line current
B) multiplying apparent power by the power factor
C) dividing power factor by the apparent power
D) multiplying phase voltage by phase current
True Power
The actual power consumed by a device in an electrical circuit, measured in watts (W), and calculated as the product of voltage, current, and the cosine of the phase angle between them.
Three-Phase Circuit
An electrical distribution system consisting of three alternating currents of the same frequency, which reach their peak values at different times.
Power Factor
The ratio of real power flowing to the load to the apparent power in the circuit, reflecting how effectively electrical power is converted into useful work output.
- Calculate power (true power, apparent power, and reactive power) in three-phase circuits.
Verified Answer
JD
Jenny DuongMay 20, 2024
Final Answer :
B
Explanation :
True power in a three-phase circuit is calculated by multiplying the apparent power (measured in volt-amperes, VA) by the power factor (a dimensionless number between 0 and 1). The power factor represents the phase difference between the voltage and current waveforms.
Learning Objectives
- Calculate power (true power, apparent power, and reactive power) in three-phase circuits.