It is a safety concern. With the switch before the bulb, the bulb is completely isolated from the potential source when the switch is turned off. With the switch behind the bulb, even if the switch is turned off, the potential source is still at the bulb. If any of these lamp holder parts touch the ground when removing the bulb the circuit will short out and trip the breaker. If you are grounded and touch any of the lamp holder parts you will get a nasty shock.
It will not work because it has to be closed so the electricity can go to the bulb.
When a bulb fuses the circuit is broken if it is on a serial circuit. If the bulb is on a parallel circuit, only the fused bulb will go out, any other bulb would remain lit. On a serial circuit, until the bulb is replaced by a new one, the circuit is not able to be used.
It doesn't matter where the bulb is in respect to the battery, as long as the circuit is complete, the bulb will light up.
*Look at the simple circuit illustrated in Figure A-2. What will happen when only switch S1 is closed? Correct Answer= "Nothing will happen-the light bulb won't light up." <<>> If there is a load in the circuit the load will operate. If there is no load in the circuit and it is complete then a short circuit will occur and something in the circuit will burn open. If the circuit is complete and there is a fuse or breaker in the circuit, then the fuse or breaker will open the circuit.
In that case, start tracking back. The turn signal switch pulls the brake light out of circuit when the signal is operating. If the switch fails, the one or both stoplights can stop working.
A switch is used of stop the current flow in a circuit and the bulb can be classed as the load in a circuit.
The simplist answers is that electricity needs to complete a circuit fully. It stops flowing because there is no complete circuit. The switch is a device for opening and closing the circuit. When the switch is in the off position the circuit is said to be open and electricity cannot flow.
Removing a bulb - or opening the switch - breaks the flow of current in a series circuit.
Switch
Close circuit is a complete circuit of battery wire bulb and a switch
The conducting path of a torch is a simple circuit: Battery to switch, switch to bulb, bulb back to battery. Provided the switch is on, and there are no breaks in the circuit wiring (and the bulb is good), the torch should work.
It depend on where the switch is located in the circuit.
A switch simply opens a circuit, stopping the flow of electricity. For example: a simple circuit would be two wires from a battery, one of which goes to a switch, and the other goes to a light bulb. A third wire goes from the other side of the switch to the other conductor of the light bulb. With the switch closed the circuit is complete and the light goes on. Open the switch and the circuit is broken and the light goes off.
A switch simply opens a circuit, stopping the flow of electricity. For example: a simple circuit would be two wires from a battery, one of which goes to a switch, and the other goes to a light bulb. A third wire goes from the other side of the switch to the other conductor of the light bulb. With the switch closed the circuit is complete and the light goes on. Open the switch and the circuit is broken and the light goes off.
It opens and closes a circuit and it makes the bulb turn off and on and it completes a circuit when it is closed.
The whole circuit fails - because the action of the bulb blowing cuts the circuit.
wiring diagram of one bulb in two switches.. example, if switch a- on then switch b- off the bulb is on, switch a- off then switch b- on the bulb is on, switch a- on then switch b- on the bulb is off, switch a- off then switch b- off the bulb is off..