Practice Questions
1. A transformer has 200 turns on the primary coil and 1000 turns on the secondary coil.If the input voltage is 240 V, calculate the output potential difference.
np = 200
Vp = 240
ns = 1000
Vs = (ns x Vp)/np
Vs = (1000 x 240)/200
Vs = 1200V
2. An electric toothbrush charges using a transformer. The charger is plugged into a 230 V mains socket and the coil inside the base has 920 turns. The coil inside the toothbrush has 40 turns.
What is the potential difference induced across the toothbrush coil?
np = 920
Vp = 230
ns = 40
Vs = (ns x Vp)/np
Vs = (40 x 230)/920
Vs = 10V
3.A machine in a factory requires 500 V to operate and is connected to a transformer coil with 1250 turns. The transformer’s other coil is connected to the 230 V supply.
How many turns are on the coil connected to the mains?
Vs = 500
Vp = 230
ns = 1250
np = (ns xVp)/Vs
Vs = (1250 x 230)/500
Vs = 575V
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