Which device changes voltage from high to low for consumer use?

• A. Voltage Range for Distribution Transformers
• B. Metering Cubicles
• C. Protection Relay
• D. Distribution Transformer

Answer: (D)

The device that changes voltage from high to low for consumer use is the distribution transformer. It sits on the edge of the network, either on a pole or in a pad-mounted unit near customers, and steps down the high distribution voltage to the lower voltage that homes and businesses need. It does this through electromagnetic induction: the primary winding is fed by the higher voltage, and the secondary winding delivers the lower voltage. Power is roughly preserved (minus losses), so when voltage is stepped down, current on the customer side increases accordingly. Metering cubicles measure usage, not transform voltage. Protection relays detect faults and trip circuits, not alter voltage. The voltage range listed for distribution transformers describes what voltages the device can handle, not a separate component that transforms voltage.