Question

define short circuit and overloading

Answer 1

Short circuit:

The circuit becomes shorter in this. The two wires neutral and phase touches each other the circuit gets shorter. The resistance becomes low and a heavy current flows through it. 

Overloading:

If the current flowing through the various instruments connected to a single supply, it draws more current. If the current drawn is more than the maximum current rating it gets overloaded. 

Answer 2

short circuit=a bad electrical connection that causes a machine to stop working

overloading=means a high very high power of light or electricity