Transmitting Power at High Voltage,e

question 21

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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