This light bulb may be on the same line as the vac. 1. Even if the dry vac is, let's say 300W, when it starts up it uses at least twice as much energy. If light dims and then goes back to normal, it's perfectly normal. 2. When light bulb dims and stays dim while operating dry vac, unplug it and never use in the same room again; it uses too much energy for the size of the wire and can cause overheating of wiring and fire! == == <><><> If the wiring is modern, check the connections on every device on that breaker or fuse. If you have a meter check the voltage at the receptacle with the vac and the light. <><><> There are two possibilities, depending on the details of the fault:
1) The bulb dims momentarily when you start the vacuum, then returns to normal brightness even while the vacuum is operating.
This is normal, as previously stated. The reason for this is that the limiting factor to current flow in a motor is the counter-voltage created by the running motor. [It actually works as a generator!. If you jam the motor so it cannot turn, the current flow through what is now an unimpeded conductor can be high enough to trip the circuit protective device!] ... and reduce the available voltage to any parallel connected device to the voltage across the motor! In this case, the resistance value of your circuit conductors can be the only significant load on the circuit [low resistance=high current!]
2) The bulb dims and stays dim throughout the operation of the vacuum.
There is something wrong with the circuit ... loose connection, partially open service neutral, partially broken wire, bad plug, dodgy breaker, etc. ... and the defect is part of the load, causing a voltage drop across the defect and your series connected motor! [voltage drop=energy usage=heat at the defect]
In this case, the bigger the load, the worse it looks!
No electricity can be used or wasted if the lamp itself is turned off. It makes no difference if it has been turned off at the wall outlet or at the lamp itself. It is the same situation as a flashlamp that has a light bulb supplied by a battery. If the flashlamp is switched off the battery inside it is still there, waiting to feed the light bulb with current, but the current can only flow into the light bulb when the switch on the flashlamp is turned on.
No as the circuit is broken so no electricity can flow through the ciircuit . <<>> Most small appliances these days have switches on them. The voltage potential is at the kettle but stops at the switch. As soon as the switch is turned on, the circuit is completed and the appliance operated. In the UK there is a switch combined with the receptacle. This switch is used to disconnect the voltage output to any device that is plugged into the outlet.
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