A switch is used of stop the current flow in a circuit and the bulb can be classed as the load in a circuit.
When the light bulb stays on when the switch is off, it is likely due to a wiring issue or a faulty switch that is not properly cutting off the electricity flow to the bulb.
The switch in a torch controls the flow of electricity to the light bulb. When the switch is turned on, it completes the circuit and allows the electricity to pass through, lighting up the bulb. Turning the switch off breaks the circuit, stopping the flow of electricity and turning off the light.
A light bulb dimmer switch works by controlling the amount of electricity flowing to the light bulb. By adjusting the voltage, the dimmer switch can regulate the brightness of the light bulb.
A switch completes the circuit, allowing electricity to pass from the cell (battery) to the bulb.
In a theoretical ciucuit, a switch is not essential. What is needed is a source of electricity.
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.
Because electricity flow through it's wire. Electricity came from outlets source. When you plugged in a device, electricity will flow into two ways. One is directed on a bulb and the other one is cut. Two points of cut wires are put in a switch so if you presses the switch, the other current (whether positive or negative) will generate full electricity that is capable of lighting a light bulb.
A standard filament bulb works on the principle that it gets hot and glows when a current is passed through it. If the filament has burned out (blown) it is open circuit and no current can flow. Therefore you are not using any electricity even if the switch is still on It may still use power if it is a lighted switch. Find a licensed electrician at www.contraxtor.com
The power to light switch in electrical circuits works by allowing or interrupting the flow of electricity to the light bulb. When the switch is turned on, it completes the circuit, allowing electricity to flow and light up the bulb. When the switch is turned off, it breaks the circuit, stopping the flow of electricity and turning off the light.
there is no electricity running thru the wires yet
The OFF position on the light switch interrupts the flow of electricity to the light bulb. If the switch is ON, there is always electricity at the light socket, even when the light bulb is removed. if the lamp is still pluged in electricity is still flowing through the lamp even if it is off or on