Transformers

• A basic transformer consists of a primary coil and a secondary coil wound on an iron core
• Iron is used in transformers as it is easily magnetised
• In a step-up transformer Vs > Vp
• In a step-down transformer Vs < Vp
• If transformers were 100% efficient, the electrical power output would equal the electrical power input
• $\frac{V_p}{V_s} =$$\frac{N_p}{N_s}$

  N = Number of turns of each coil