For transmission, at or outside of which location is voltage typically stepped up?

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Multiple Choice

For transmission, at or outside of which location is voltage typically stepped up?

Voltage is stepped up for transmission at the generating station, where a step-up transformer raises the generator’s output to the high voltages used on the transmission network. This high voltage means the same amount of power travels with much lower current, which minimizes losses in long-distance lines (I squared R losses) and makes efficient transmission possible. After the power travels through the transmission network, voltage is stepped down at substations for distribution to customers. The other options don’t fit because a pole-mounted transformer on the distribution system is used to step voltage down, and stepping up inside a lamp or after the customer is not how transmission voltages are handled.

Voltage is stepped up for transmission at the generating station, where a step-up transformer raises the generator’s output to the high voltages used on the transmission network. This high voltage means the same amount of power travels with much lower current, which minimizes losses in long-distance lines (I squared R losses) and makes efficient transmission possible. After the power travels through the transmission network, voltage is stepped down at substations for distribution to customers. The other options don’t fit because a pole-mounted transformer on the distribution system is used to step voltage down, and stepping up inside a lamp or after the customer is not how transmission voltages are handled.

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