Physics for IGCSE & O level - Magnets And Currents (Section 11 - No. 49)
If a transformer has a primary voltage of 120 V, a secondary voltage of 24 V, and the primary coil has 1000 turns, how many turns does the secondary coil have?
200 turns
480 turns
2000 turns
5000 turns
Giải thích
Using the formula: Vp/Vs = Np/Ns -> 120/24 = 1000/Ns. Thus Ns = 200