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Some household appliances have plugs with two prongs while others have three prongs. The additional prong...

Some household appliances have plugs with two prongs while others have three prongs. The additional prong is

for additional mechanical strength.

for 240-Hz voltage.

to connect to ground.

for 120-Hz voltage.

for direct current.

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Answer #1

The additional putting is to connect to ground.

Some appliances might get short circuit, or have some charge leakage from the circuit to the body of the appliance. When you touch these appliances the charge flows through you and give you a shock, in some cases shocks could be lethal. To prevent this, manufacturers provides an alternative route for the charges to flow directly to the ground via the third prong.

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