Question

Which quantity is increased in the step-down transformer?

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

Answer 1

The correct option is A

Current

The explanation of the correct option:

In the case of option A,

1. A transformer is a device that converts the alternating current voltage at its greater voltage input to the lower voltage at its outcome without affecting the frequency.
2. The step-down transformer transforms high voltage to low voltage, but the power provided remains constant, hence the current increases according to the $\mathrm{P}=\mathrm{V}\times \mathrm{I}$ relationship.

The explanation for the incorrect options:

1. In the case of option B, a step-down transformer lowers the voltage output but rather transforms high voltage, low current power into lower voltage level, high current electricity.
2. In the case of option C, this transformer transforms high-voltage, low-current energy into low-voltage, sufficient power. Because of the increased current, the secondary winding requires a bigger gauge wire.
3. In the case of option D, voltage is converted but not frequency using step-down transformers. There is no transformer that can alter the frequency.

Therefore, option A (current) is the correct answer.