Question

Why does we need to plug our appliances into electric sockets?

Answer 1

Answer:

Because having a grounding wire and grounded (three-pronged) outlets adds an extra level of safety, newer houses and buildings are required to have three-pronged outlets with grounding wires. The appliance you were trying to plug in could also get a large electric current, potentially ruining it.

Answer 2

Answer:

It also stabilizes voltage and protects people, properties, and equipment from electric shock. For example, say something happened to the hot wire in the plug. When you plugged something into a two-pronged outlet you would most likely get a shock.