The operation of a transformer (AQA A-Level Physics): Flashcards

Change voltage of AC

$\frac{N_s}{N_p} = \frac{V_s}{V_p}$

Increases voltage; more turns on secondary coil

Decreases voltage; fewer turns on secondary coil

Changing magnetic field induces EMF via Faraday's Law

$\frac{I_s V_s}{I_p V_p} \times 100\%$

Use laminated iron core

$P = I^2 R$

Reduces current, minimising $I^2 R$ losses

Primary coil, secondary coil, iron core