# FAQs - Power Factor Correction (PFC) Systems

How power factor correction (PFC) systems can improve energy efficiency with reactive loads.

### What does Power Factor measure?

Power Factor (pF) is the difference between the actual energy consumed (Watts), and the Volts x Amps in a circuit.Power factor may be lagging, where the current waveform lags the voltage waveform, or leading where the current waveform leads the voltage.

### What is Distortion Power Factor?

Distortion Power Factor is the power factor produced by the harmonics generated from non-linear loads.

### What is Displacement Power Factor?

Displacement Power Factor is the ratio of Real Power (W) to Apparent Power (VA) at the fundamental frequency.

### What does Total Power Factor measure?

Total Power Factor  or True Power Factor is the total power factor including both distortion and displacement power factors.

### What does Reactive Power measure?

Reactive Power is a flow of energy (measured in VAr) superimposed back onto the supply source from which it was drawn. The flow of energy is the difference between the Real Power (kW) and the Apparent Power (kVA) required by some electrical equipment in order to operate. Reactive Power increases the amount of current that has to be provided by the District Network Operator (DNO) to a site and is charged for by the utility supplier.

### What is capacitance?

Capacitance is the ability of a circuit to store electrical energy as a charge. The circuit is known as a capacitive circuit.