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Chapter 30: Q. 23 (page 870)

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

Short Answer

Expert verified

Turns on the side that plugs into the outlet is2400turns.

Step by step solution

01

Formula for number of turns

The secondary coil is the side that is connected to the electronic gadget.

The primary coil is the one that is connected to the plug.

The primary coil must contain more coils than the secondary coil to scale down the voltage.

The number of turns is precisely proportional to the induced emf, according to Faraday's law.

V2V1=N2N1

WhereV1andlocalid="1648828624813" N1are the primary coil's emf and the number of turns.

WhileV2and localid="1648828631790" N2are the secondary coil's emf and the number of turns.

N1=V1V2N2

02

Calculation of number of turns

As it stands,

V1=120V

V2=3V

N2=60

Number of turns,

N1=V1V2N2

=120V3V脳60turns

=2400turns

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