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Hi my name is Megan and im doing a science report on energy. I chose to do Electrical energy, but I need to include demonstrations in the project. Im having a really hard time finding easy to do Demos. I need to present the demos so id like to keep it simple and small. Do you have any suggestions? Please Help!
Charged capacitors provide a good example of stored electric energy.
Capacitors are easy to buy, and the are found in a number of devices
including disposable cameras that have flashes. The battery within the
camera stores chemical energy, which is released slowly as electrical
energy. This energy is transfered to the capacitor (you can often hear
them charging) and stored as electric energy. The capacitor releases
the energy very quickly when a flash is made. If you choose to use a
capacitor, BE VERY VERY CAREFUL!!! Ones that are charged to high
voltage can make big sparks, because they can deliver more current for
a short time than batteries can. Make sure that your capacitor is only
charged up to a few volts.
Anyway, you can then discharge it into a flash bulb to illustrate the release of the stored energy.
(republished on 07/25/06)
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