AC MACHINES-1 (66761) Theory

To calculate the transformer efficiency, divide the output power by the input power. Example: with an output power of 1254 watts for an input power of 1320 watts, divide 1254 by 1320, which equals . 95, or an efficiency of 95 percent.

The ordinary transformer has a very high efficiency (in the range of 96—99%). Hence the transformer efficiency cannot be determined with high precision by direct ...

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% .

Efficiency of transformer is simply given as:

• The output power is the product of the fraction of the rated loading (volt-ampere), and power factor of the load
• The losses are the sum of copper losses in the windings + the iron loss + dielectric loss + stray load loss.