A television contains a small step-up transformer that produces the very high voltages needed to accelerate electrons toward the front of the picture tube. When low voltage alternating current passes through the primary coil of this transformer, power is extracted from that current and passed to an alternating current flowing through the secondary coil of the transformer. The electric current in the secondary coil
A) is greater than that in the primary coil.
B) is less than that in the primary coil.
C) is equal to that in the primary coil..
D) is direct current (DC).

Question

Quizplus · Accepted Answer

In a step-up transformer, the voltage is increased from the primary to the secondary coil. According to the principle of conservation of energy, if the voltage increases, the current must decrease to keep the power (P = VI) constant. Therefore, the electric current in the secondary coil, where the voltage is higher, is less than that in the primary coil.

A Television Contains a Small Step-Up Transformer That Produces the Very