In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of
A)less than 15 A
B)more than 15 A
C)15 A
D)none of the above

Question

Quizplus · Accepted Answer

In a step-down transformer, the primary (supply) current will decrease if the secondary (load) current increases, due to the conservation of power (assuming ideal conditions). The change in primary current will be less than the change in secondary current if the transformer is stepping down the voltage, because power (P = VI) must be conserved, leading to an inverse relationship between changes in current and voltage.

In a Step-Down Transformer, There Is a Change of 15