Canonical Definition
Power factor is the ratio of real power (kW) to apparent power (kVA) in an AC electrical system, ranging from 0 to 1, indicating how effectively current is converted into useful work. Low power factor, often caused by inductive loads such as motors, requires the utility to supply more current for the same useful power, increasing system losses and capacity needs. Many utilities apply power factor penalties or adjustments to commercial and industrial bills; residential customers are generally not billed for power factor.
Explanations
Power factor measures how well a building uses the power sent to it. The scale runs from 0 to 1. A low power factor means the utility must push extra current through its wires for the same useful power. That adds strain and cost to the system. Utilities often charge businesses a penalty for low power factor. Homes are usually not billed for it.
Power factor is a score for how much of the power sent to a building does useful work. A perfect score is 1. Think of a glass of lemonade that is all juice and no foam.
Analogy Bank
Power factor is like a horse pulling a barge at an angle — the more off-angle the pull, the more effort is wasted for the same forward motion.
It's like rowing technique: a power factor near 1 means almost every stroke actually moves the boat.
For a business, low power factor is like a poor fuel-economy rating — the same useful output requires more delivered input.
Do Not Say
- ✕Do not state penalty thresholds or charges for low power factor; they vary by utility tariff.
- ✕Do not suggest residential customers buy power-factor correction gadgets or promise such devices save money; homes are generally not billed for power factor.
- ✕Do not give equipment-specific electrical advice; refer customers to a qualified professional.