Today I had an electrical problem at my home not yet resolved. I will explain the problem.
The switch for water motor and switch for lamp are nearby in same board. When I turn ON the lamp switch, the lamp is glowing untill the switch for motor is OFF. When the motor switch is turned ON the lamp despite its switch turned ON stops glowing and motor is also not operating. When the motor switch is turned ON with lamp switch OFF, the motor is not operating. The performance of other electricals in home is not disturbed.
What may be the reason?
As a school boy electrical enthuiasist I suspect there may increase in ohmic resistance at wire (due to some effects) series to the parallel combination of these two switches. So lamp which has high resistance able to grab some enough voltage despite that unknown series resistance. But motor which has lower resistance cannot.
Can you explain technically?
Edit: The motor was working well for years with same electricals undisturbed. This fault occured today.
Best Answer
Difficult to say without seeing the switches and wiring, but I would suspect a bad connection or wiring fault somewhere. You do not say if it has always been like this or if the fault has developed recently. One of the wire terminals on the switches may be lose or corroded, or maybe at the lamp, motor or distribution board.
I would very much doubt that the wires themselves have changed in resistance unless they are damaged and badly corroded.
The solution is to ask competent electrician to examine the setup and remake the connections as necessary. You say you are "school boy electrical enthusiast" so PLEASE DO NOT TRY TO DO THIS YOURSELF if you want to eventually become an adult electrical enthusiast.