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Flashlight Physics



As the end of the school year comes to an end I am becoming ecstatic just thinking about camping. Every year, my family goes to the Thousand Islands and camps out. During that week we spend our time swimming, jet skiing and hanging around the campfire. That is a week I look forward to every year. A very useful tool that needs to be brought every year is a flashlight. We need this instrument because walking around at night can become directionless without know in which way your destination is. Through this blog I hope to inform and remind others of how the physics of a light flash works.

Everyone knows know flashlights has batteries in them; what a battery does is it uses a chemical reaction to put all the (+) charges on one side of the battery and all the (-) charges on the opposite side of the battery. Because like charges repel each other the (-) charges do not like being all together at one end of the battery. When a wire is connected from one end of the battery to the other end the (-) charges, electrons, are able to flow through to get away from each other and get to the (+) charges on the other side. This idea is an example of 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 (-) charges into light. Pushing down on the switch of the flashlight connects the wire with the light bulb to the battery and forms the circuit.

In the setting of camping, I am very grateful that circuits are dependable and safe because camping could be much more difficult with out them: thank you physics!


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