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Why will a bulb not light if a switch is open in a circuit?
It will not work because it has to be closed so the electricity can go to the bulb.
Why does a light bulb light in a closed circuit?
A bulb does not light up if there is no voltage available across the bulb, or if the bulb is burned out.
Why does the bulb not light up until you press the switch?
the bulb will light up when current flows thru it if the switch is open no flow will take place
Can a bulb work as a switch?
First answer: No. Second answer: Yes. A light bulb is a resistance. Current flows across a tungsten filament, heating it to produce light. However, if there was some other resistance wired into a closed circuit, a screw type bulb could be used as a switch. You unscrew it to throw open the circuit, effectively turning off whatever else was wired in the line. Screw it back in to switch it on. So yes, you could use a light bulb as a switch. Some switches have LED (light emitting diodes) built into them so they light up when the switch is closed, and turn off when the switch is open. And some switches are wired just the opposite, so the LED is on when the switch is off. This makes these types of switches easier to find in the dark.
If you wired up the circuit with a bulb two batteries and a switch with a thin wire what will happen?
the bulb will light up
How do you know that house lights are wired?
When you turn the light switch to the up (on) position, if the bulb is not burned out, the light bulb will glow.
Where does electricity come from inside a torch?
A tiny light bulb with a reflector is lit up with a battery. The switch connects the electric circuit; the power flows through the wire and the bulb lights up.Current through resistive filament of globe produces heat and light.Well first there's these two batteries inside it, then there's a wire inside it connecting it to the light bulb. then it makes one light bulb or more light by the energy of the battery. that makes the flashlight light. also there's a switch that connects a wire. if you pull the wire forward it will connect and make it light. but the opposite way makes the part of the switch go back and the light bulb won't light.
Why doesn't a bulb light up until you press the switch?
A switch completes the circuit, allowing electricity to pass from the cell (battery) to the bulb.
Why does a light bulb light up immediately after you turn on a switch even if the switch was a long way from the bulb?
The light will come on instantly (incandecent bulbs only), because current travels faster than the speed of light (theory).
Why are your back up lights always on?
The back up light switch is stuck closed or broken.
What will happen if the two switches connected to light up a single bulb are on?
It is dependant on whether the switches are in wired in a parallel or series configuration. If the switches are wires in parallel then both switches would have to be off to turn the light bulb off. Either switch could turn the light bulb on. If the switches are wired in series then both switches would have to be on to turn the light bulb on. Either switch could turn the light bulb off.
What is the job of the cells and wires and bulb and switch in a torch?
The job of a bulb is to give off heat and light energy
