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When you open a switch to a light for example, you cause a break in the flow of current to the light. Opening a light switch means you are turning the light off by stopping the flow of current to it. Closing a switch means you have completed a circuit (basically a loop) and current now flows causing the light to go on. Think of electricity like water. To cause your bath tub to fill up (light on) you have to also complete the circuit by turning the tap. Now we have water flow. (current) To stop the flow of water, we want to open the circuit by turning the tap in the opposite direction causing a break in the flow of water.

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12y ago
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6y ago

One example is that when you switch off a room light, the switch is moved to the open position. Therefore, electricity is unable to pass beyond the gap caused by the open switch and the room light is unlit.

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9y ago

Nothing. All the battery voltage is across the open switch, and no current flows.

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9y ago

Nothing happens because with the switch in the open position, no current will flow through the circuit.

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Q: What happens when the switch is open in a circuit containing wires a light bulb a switch and a battery?
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A torch is simply a circuit containing a battery, a bulb and a switch. The three components are connected in series (one after the other) to form a loop. The switch simply completes the circuit so that power flows from the battery to the bulb.


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