Question

We know that earth is an electron bank and that it has zero potential. But quite often we get electric shock from computer despite proper earthing.

a. Can electric shock from electric devices be avoided by earthing alone? 

b. Proper earthing will give us safety from electric shock. What is meant by proper earthing? How can the earthing arrangement by done properly to ensure safety?

Answer 1

a. No 

b. Earth wire should carry all charge from the metal body of an electrical device to the earth effectively.

• Wire of suitable thickness must be used. 
• Pits must be prepared to ensure effective earthing.
• Metal plates having large area as in plate earthing can be used.