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In England, standard household voltage is 240 volts. If you brought your own
hair dryer on a trip there, you would need a transformer to step down the voltage
before you plug in the appliance. If the transformer steps down voltage from 240
to 120 volts, and the primary coil has 50 turns, how many turns does the
secondary coil have?
The voltage transformation is in direct proportion to the ratio of the turns in each winding. To transform 240 volts to 120, the secondary needs 25 turns.
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