The amount of __________ delivered by the secondary winding is less than the amount supplied to the primary winding.

The amount of __________ delivered by the secondary winding is less than the amount supplied to the primary winding.

• A. Power
• B. Energy
• C. Voltage
• D. Current

Answer: (A)

The key idea is that real transformers don’t transfer all input power to the secondary. The primary supplies power P_in = V_p × I_p, while the secondary delivers power P_out = V_s × I_s to the load. Because of losses in the transformer (like copper losses in the windings and core losses in the magnetic core), P_out is smaller than P_in. The difference shows up as heat. So the secondary delivers less power than the primary supplies, which is why power is the correct term. Voltage and current can change with the turns ratio and load, and energy over time relates to power, but the decisive point is the power transfer being imperfect due to losses.

The key idea is that real transformers don’t transfer all input power to the secondary. The primary supplies power P_in = V_p × I_p, while the secondary delivers power P_out = V_s × I_s to the load. Because of losses in the transformer (like copper losses in the windings and core losses in the magnetic core), P_out is smaller than P_in. The difference shows up as heat. So the secondary delivers less power than the primary supplies, which is why power is the correct term. Voltage and current can change with the turns ratio and load, and energy over time relates to power, but the decisive point is the power transfer being imperfect due to losses.