Power transformers in substations change the sub transmission voltage to lower levels and provide a source for the ________ circuits extending short distances to the customer's premises.

Power transformers in substations change the sub transmission voltage to lower levels and provide a source for the ________ circuits extending short distances to the customer's premises.

• A. transmission
• B. commercial
• C. secondary
• D. distribution

Answer: (D)

Power transformers in substations step voltage down from subtransmission levels to distribution levels, creating the source for distribution circuits that run short distances to customers. Distribution circuits are the local feeders that carry power from the substation to service points and neighborhoods, eventually delivering it to customers. Transmission circuits carry high voltage over long distances, and secondary circuits refer to the very low-voltage conductors on the customer side after service, not the feeder network from the substation. Therefore, the blank is filled with distribution.

Power transformers in substations step voltage down from subtransmission levels to distribution levels, creating the source for distribution circuits that run short distances to customers. Distribution circuits are the local feeders that carry power from the substation to service points and neighborhoods, eventually delivering it to customers. Transmission circuits carry high voltage over long distances, and secondary circuits refer to the very low-voltage conductors on the customer side after service, not the feeder network from the substation. Therefore, the blank is filled with distribution.