Canonical Definition
Apparent power, measured in kilovolt-amperes (kVA), is the product of RMS voltage and current in an AC circuit, representing the total power the electrical system must carry. It comprises real power (kW), which performs useful work, and reactive power (kVAR), which sustains magnetic and electric fields in equipment such as motors. The ratio of real to apparent power is the power factor. Some utilities bill demand in kVA or apply power factor adjustments, primarily for commercial and industrial customers.
Explanations
Apparent power is the total power the utility's wires must carry to serve you. It is measured in kilovolt-amperes (kVA). Part of it, called real power, does useful work like running appliances. The rest, called reactive power, supports gear like motors but does no direct work. The link between the two is called power factor. Apparent power mostly matters for business bills. Homes are usually billed only on real energy use.
Apparent power is the total push the power system must send. Only part of it does useful work. It is like a full backpack when you only need some things inside.
Analogy Bank
Apparent power is like a delivery truck's total load including the packaging: the road must support all of it, even the part that isn't cargo.
For a business, kVA is like the total bandwidth a connection must be provisioned for, not just the data you actually use.
Do Not Say
- ✕Do not tell residential customers they are billed on kVA; apparent power billing mainly applies to commercial and industrial accounts.
- ✕Do not provide engineering advice on managing kVA or reactive power; refer customers to a qualified electrician or their utility.