Which device is used to reduce voltage in electrical circuits?

Which device is used to reduce voltage in electrical circuits?

• A. Transformer
• B. Resistor
• C. Capacitor
• D. Diode

Answer: (A)

Voltage can be reduced most effectively by a device that uses mutual induction between two coils. When the secondary winding has fewer turns than the primary, the output voltage is lower than the input, producing a step-down effect while the current capability increases appropriately. This works with alternating current because changing magnetic flux induces voltages in the secondary coil. Resistors drop voltage based on Ohm’s law but waste energy as heat and aren’t used to reliably reduce supply voltage. Capacitors store charge and shape AC signals, but they don’t provide a fixed, controlled voltage reduction. Diodes control current direction and can rectify AC to DC, not provide a general voltage step-down. So the device designed to reduce voltage in circuits is the transformer.

Voltage can be reduced most effectively by a device that uses mutual induction between two coils. When the secondary winding has fewer turns than the primary, the output voltage is lower than the input, producing a step-down effect while the current capability increases appropriately. This works with alternating current because changing magnetic flux induces voltages in the secondary coil. Resistors drop voltage based on Ohm’s law but waste energy as heat and aren’t used to reliably reduce supply voltage. Capacitors store charge and shape AC signals, but they don’t provide a fixed, controlled voltage reduction. Diodes control current direction and can rectify AC to DC, not provide a general voltage step-down. So the device designed to reduce voltage in circuits is the transformer.