Power Factor and Phase Relationships in AC Circuits Quiz

The power factor of a purely resistive circuit is 1, indicating that the current is in phase with the voltage.

When current and voltage are in phase in an AC circuit, the power factor is 1.

The power factor is a dimensionless quantity and has no unit.

The range of power factor values in most practical AC circuits is between -1 and 1.

The unit of reactive power is Volt-Ampere Reactive (VAR).

Power factor (PF) is calculated using the formula PF = V * I * cos(θ), where V is voltage, I is current, and θ is the phase angle.

A leading power factor indicates a capacitive circuit, where the current leads the voltage in the circuit.

The power factor of a purely inductive circuit decreases, indicating a phase lag between voltage and current.

In AC circuits, a higher power factor is associated with higher energy efficiency.

A capacitor is commonly used to improve power factor in AC circuits through power factor correction.

In a circuit with a lagging power factor, the phase angle between current and voltage is positive.

The mathematical relationship between power factor and cosine of the phase angle is PF = cos(θ).

The cosine of the phase angle in a circuit with a power factor of 0.8 is 0.8.

In a circuit with a power factor of 0.5, the real power is double the apparent power.

The power factor of an ideal inductor is 0.