The correct answer is: A. Less than unity.
A power factor is a dimensionless number that measures how efficiently electrical energy is being used in a circuit. A power factor of 1 indicates that all of the electrical energy is being used, while a power factor of less than 1 indicates that some of the electrical energy is being wasted.
In a DC circuit, there is no reactive power, so the power factor is always less than unity. This is because the current and voltage are always in phase in a DC circuit, so there is no phase angle difference between them.
In an AC circuit, there can be both active and reactive power. The active power is the power that is used to do work, while the reactive power is the power that is used to store and
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