# Why is the transformer rating not in kW?

Contents

## Why transformers are not rated in kW?

The copper loss depends on the current (ampere) flows through the windings of the transformer while the iron loss depends on the voltage (volts). … i.e., the rating of the transformer is in kVA.

## Why transformers are rated in kVA and motor in kW?

Transformers have copper losses and iron losses. Copper loss depends on current and iron loss depends on voltage. … All AC devices that supply power, such as transformers, UPS, generators, etc are rated in kVA. Devices that consume power, have a kilowatt rating, because we know what its power factor is.

## Why motor ratings are in kW not in kVA?

Motor is rated in kW since it specifies the capacity of the motor to drive its load. It is the active power (kW) that is of interest when a motor drives a load. The motor converts the active power that it draws from the mains into mechanical power that the load consumes/demands.

## Why is kVA used instead of kW?

kW is the amount of ‘actual power’ an electrical system has. This shows you how much power is being converted into useful, working output. kVA, on the other hand is the measure of ‘apparent’ power. If kW is how much power you can work with, kVA tells you how much is being used in the system overall.

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## Why OC test is performed in a transformer?

The purpose of the open-circuit test is to determine the no-load current and losses of the transformer because of which their no-load parameters are determined. This test is performed on the primary winding of the transformer. The wattmeter, ammeter and the voltage are connected to their primary winding.

## Is kVA equal to kW?

Convert the Real Power in Watts to Apparent Power in kVA (Kilovolt amps). Watts divided by 1000 times the power factor is equal to kilovolt-amps.

kVA And kW Relation for AC And DC Circuits.

Condition Formula
DC Circuit Power Factor=1 kW= kVA

## What is difference between kW and kVA?

What is the difference between kW and kVa? The primary difference between kW (kilowatt) and kVA (kilovolt-ampere) is the power factor. kW is the unit of real power and kVA is a unit of apparent power (or real power plus re-active power). … The kilovolt-amperes (kVa) are the generator end capacity.

## Why motor is rated in HP?

Later, when steam engines were replaced by electric motors as prime movers, the custom of rating them in horsepower continued. Subsequently, as a mark of respect to the great inventor, the British Association gave his name to the unit of electrical power, which, later was adopted by the SI System of units.

## What does kW mean in motors?

EV motor power (kW)

The car’s power is fairly straightforward and refers to the electric motor’s maximum output. This is measured in kilowatts (or 1000 watts) just like a normal internal combustion engine (ICE). The higher the kW figure, the more oomph you’ll get at the expense of energy consumption.

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