Physics · AC generator and transformer
A step-down transformer is used to light lamp from a mains supply. The lamp ligh
A step-down transformer is used to light \( 12 V \) lamp from a \( 240 V \) mains supply. The lamp lights at normal brightness. The primary coil has 600 turns. How many turns are in the secondary coil?
- A. 12
- B. 20
- C. 30 \)
- D. 50
Step-by-step solution
Using the transformer turns ratio: Vp/Vs = Np/Ns => Ns = Np * Vs / Vp = 600 * 12 / 240 = 30.
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