If current is stepped up in a transformer, what happens to voltage?

If current is stepped up in a transformer, what happens to voltage?

• A. Voltage increases
• B. Voltage stays the same
• C. Voltage fluctuates
• D. Voltage decreases

Answer: (D)

In a transformer, the volt‑ampere balance means power in roughly equals power out, so voltage and current move inversely. If the current on the secondary side is higher than on the primary (Is > Ip), the voltage on the secondary must be lower than the primary (Vs < Vp) to keep Vp Ip ≈ Vs Is. This is why stepping up current corresponds to a decrease in voltage. In practice, losses exist, but the basic relationship remains: increasing current on the output side comes with a decrease in voltage.

In a transformer, the volt‑ampere balance means power in roughly equals power out, so voltage and current move inversely. If the current on the secondary side is higher than on the primary (Is > Ip), the voltage on the secondary must be lower than the primary (Vs < Vp) to keep Vp Ip ≈ Vs Is. This is why stepping up current corresponds to a decrease in voltage. In practice, losses exist, but the basic relationship remains: increasing current on the output side comes with a decrease in voltage.