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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 2

Option 4 : Power factor

In AC circuits, the power factor is defined as the ratio of the real power flowing to the load to the apparent power in the circuit.

Hence power factor can be defined as watts to volt-amperes

Power factor = cosϕ

Where ϕ is the angle between voltage and current.

If the current lags the voltage, the power factor will be lagging.

If the current leads the voltage, the power factor will be leading.

1) The ratio of real power to apparent power

2) P/VI represents the ratio of the real power to apparent power, it is known as power factor

3) R/Z also represents the power factor from the impedance triangle