Motors in kW, transformers in kVA? Simple explanation!
🔌 Why are source powers expressed in kVA while load (motor) powers are expressed in kW? 🔌
In this explanatory video, we will clarify a key question in electricity: why are the powers of electrical sources (such as transformers or generators) expressed in kVA, while the powers of loads, such as motors, are indicated in kW?
Why do manufacturers express source powers in kVA? The source is a voltage source, delivering a constant voltage with a variable current depending on the load. Since the manufacturer doesn't know the precise power factor of the connected loads, the power is therefore expressed in kVA.
Why are load powers, such as motors, expressed in kW? We know their precise characteristics, including the power factor. Practical example with a 15 kW motor.
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