Transmitting Power at High Voltage, E

question 35

Multiple Choice

Transmitting power at high voltage, e.g., 400,000 V, reduces the power loss for transmission lines. But such a voltage would destroy electrical devices in household use. How then can such 400,000 V electricity be used in a normal house?

• A) The ground prongs on household plugs reduce the voltage to 120 V.
• B) Before reaching households, transformers are used to reduce the voltage appropriately.
• C) No matter the incoming voltage, a 120-V device only lets 120 V in.
• D) The 400,000 V is just theoretical; long distance transmission lines actually use 120 V.

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