Types of transformer
Step-down · Step-up · Np/Ns = Vp/Vs
Name the primary and secondary coils
Recognise a step-down transformer
Recognise a step-up transformer
Use the formula to find turns or voltage
Primary coil: the input, connected to the supply
Secondary coil: the output, current is induced here
\( N_p, N_s \) turns; \( V_p, V_s \) voltages
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