Some household appliances have plugs with two prongs while others have three prongs. The additional prong is for 120-Hz voltage. to connect to ground. for direct current. for additional mechanical strength. for 240-Hz voltage.

Some household appliances have plugs with two prongs while others have three prongs. The additional prong is for 120-Hz voltage. to connect to ground. for direct current. for additional mechanical strength. for 240-Hz voltage.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter15: Alternating-current Circuits

Section: Chapter Questions

Problem 9CQ: Why do transmission lines operate at very hig1 voltages while household circuits operate at fairly...

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Some household appliances have plugs with two prongs while others have three
prongs. The additional prong is
for 120-Hz voltage.
to connect to ground.
for direct current.
for additional mechanical strength.
for 240-Hz voltage.

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