HSC Together Year 12 Physics: Power Loss in Transformers

#### Physics

• Electromagnetism
• The Nature of Light
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# Power Loss in Transformers

This section is part of the HSC Physic syllabus Module 6: Electromagnetism under Electromagnetic Induction.

Transformers are used to increase or decrease voltages and currents.

Basic formulae for transformers are the following:

\frac{N_p}{N_s} =  \frac{V_p}{V_s} = \frac{I_s}{I_p}

Note that current is inversely proportional to the number of turns and voltage.

### Power loss in transformers

As much as we would like transformers to be ideal, they aren’t. Some of the losses in a transformer are:

• Heat losses
• Eddy currents
• Flux leakage

To find power loss we use:

P_L = I^2 R

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