Answer:
Apparent power is defined as the power that is “apparently” absorbed by a system. That is, the product of current times voltage tells us a device appears to be using a certain amount of power. However, this does not take into account the fact that the device can store (or delay) current or voltage and this results in the calculations being slightly skewed.
Apparent power is useful when we have a device like a diesel generator, where the wires inside have a limited capacity to pass current and we may not know in advance what will be connected to the generator. In other words, it doesn’t matter what the delay (or phase angle) is, the generator can only allow a limited amount of current to pass through its wires.
Because of this, many generators (and most transformers) are rated in volt-amperes (VA), or thousand-volt-amperes (kVA). The apparent power in KVA multiplied by the power factor
(PF) is the real power in kilowatts (KW).
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