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CBSE Class 10 Answered

How do flashlights work?
Asked by Mrinal | 07 Aug, 2011, 12:00: AM
Expert Answer
Flashlights have batteries in them. what a battery does is it uses a chemical reaction to put all the plus charges on one side of the battery and all the minus charges on the opposite side of the battery. Because like charges repel each other (want to get away from each other) the minus charges don't like being all together at one end of the battery. When we connect a wire from one end of the battery to the other we give the minus charges (also called electrons) a path they can flow through to get away from each other and get to the plus charges on the other side. This is called a circuit. A flashlight is a kind of circuit with a light bulb on the wire. A light bulb is just a device that changes the energy of the moving minus charges into light (it does this by getting hot and glowing brightly). Pushing down on the switch of your flashlight connects the wire with the light bulb to the battery and forms the circuit.
Answered by | 08 Aug, 2011, 03:43: AM
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