The charger for your electronic devices is a transformer. Suppose a 60 Hz outlet voltage of 120 V needs to be reduced to a device voltage of 3.0 V. The side of the transformer attached to the electronic device has 30 turns of wire. How many turns are on the side that plugs into the outlet?

Number of turns in primary will be 1200

Explanation:

We have given frequency of the supply f = 60 Hz

Supply voltage that is primary voltage

We need voltage at output as 3 volt

So secondary voltage

Number of turns in the primary is

We have to find the number of turns in secondary

For transformer we know that

Putting all values

So number of turns in primary will be 1200