In a transformer, when the secondary voltage rises, the secondary current tends to

In a transformer, when the secondary voltage rises, the secondary current tends to

• A. rise
• B. stay the same
• C. fluctuate
• D. fall

Answer: (D)

The key idea is that the secondary current in a transformer is determined by the load on that side and how the transformer’s winding impedance affects voltage under load. When the secondary voltage rises, it usually means the secondary is lightly loaded or near no-load; with less current flowing, the voltage drop across the transformer’s internal impedance decreases, so the secondary voltage climbs toward its no-load value. Since the load is drawing less current under this light-load condition, the secondary current tends to fall. In contrast, heavy loading would lower the secondary voltage (due to larger drops) while pulling more current, so the observed inverse relationship between rising voltage and falling current reflects how transformer regulation and load interact.

The key idea is that the secondary current in a transformer is determined by the load on that side and how the transformer’s winding impedance affects voltage under load. When the secondary voltage rises, it usually means the secondary is lightly loaded or near no-load; with less current flowing, the voltage drop across the transformer’s internal impedance decreases, so the secondary voltage climbs toward its no-load value. Since the load is drawing less current under this light-load condition, the secondary current tends to fall. In contrast, heavy loading would lower the secondary voltage (due to larger drops) while pulling more current, so the observed inverse relationship between rising voltage and falling current reflects how transformer regulation and load interact.