After passing the switch , torch does not glow list different factors which could be responsible for it

Dear Student,
Factors that are responsible for not glowing of torch are:
(1.) May be the switch or key is off.
(2.) Reason might be the circuit is not complete.
(3.) Not enough power supply.
(4.) A connection placed in the wrong area.
(5.) Overheating might also be the reason for not working of an electric circuit.
(6.) May be the bulb of torch is not in working condition or it is fused.
Regards