Homework Help: physics

Posted by help physics on Saturday, August 25, 2012 at 1:37am.

a transformer has 200 turns in its primary coil, the potential difference across the transformer is 220V needs to operate an electrical instrument uses a 110 volts. the number of turns in its secondary coil is:
a) 100 turns
b) 200 turns
c) 110 turns
d) 220 turns

physics - Damon, Saturday, August 25, 2012 at 1:40am
to get half the voltage you need half as many turns in the secondary, so a.

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