Question

The primary coil of a transformer contains 100 turns; the secondary has 200 turns. The primary coil is connected to a size AA battery that supplies a constant voltage of 1.5 volts. What voltage would be measured across the secondary coil?

• A. 3 volts
• B. 0.75 volts
• C. 0 volts
• D. 1.5 volts

Answer 1

The correct option is C

0 volts

Electrical power transformer is a static device which transforms electrical energy from one circuit to another without any direct electrical connection and with the help of mutual induction between two windings. The DC current in the primary coil would be constant, consequently the magnetic flux associated with it will also be constant. Thus no emf will be induced in the secondary coil.