# Why the efficiency of a transformer higher than that of a motor?

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## Why is the efficiency of transformers more than that of other rotating machines?

Why is the efficiency of transformers more than that of other rotating machines? There are no moving parts in transformer. So the friction and mechanical losses are absent in the transformer. Thus the efficiency of the transformer is more than that of other rotating machines.

## When the efficiency of transformer is high?

Just like any other electrical machine, efficiency of a transformer can be defined as the output power divided by the input power. That is efficiency = output / input . Transformers are the most highly efficient electrical devices. Most of the transformers have full load efficiency between 95% to 98.5% .

## Why do transformers have high efficiency?

Electrical transformer is a static device which transfers the power from one circuit to other through electromagnetic induction. … Losses in the transformer are very less compared to any other rotating machine, hence efficiency of transformers will be very high.

## Which has more efficiency transformer or motor?

Whereas motor is made of stator and rotor which when excited with input electrical energy converts into mechanical energy. Coming to the efficiency due to the copper losses and frictional losses which is more in motor the efficiency of motor is less than that of transformer whose copper loss is less.

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## Can a transformer be 100% efficient?

An ideal transformer would have no losses, and would therefore be 100% efficient. … Transformers are in general highly efficient, and large power transformers (around 100 MVA and larger) may attain an efficiency as high as 99.75%.

## What is the maximum efficiency of transformer?

The transformer will give the maximum efficiency when their copper loss is equal to the iron loss. Copper loss: A loss in a transformer that takes place in the winding resistance of a transformer is known as the copper loss.

## What will happen if the efficiency of transformer is poor?

What will happen if the efficiency of a transformer is poor? Poor efficiency of transformer will cause power loss and so loss of money. … (power loss in windings = i**2 x r (i square r), where r is the resistance of the winding.

## What increases in step down transformer?

In words, in a step –down transformer the voltage decreases and current is proportional. … It converts high voltage, low current power into a low voltage, high current power, in short a step-down transformer reduces the output voltages. If a step-down transformer, voltage decreases corresponding current increases.