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Make throwies to learn Ohm's Law 
MAKE Magazine | by Chris Connors | Wed, Nov 19
MAKE Magazine is the #5 Blogger for LED lamp
Many instructional materials for learning to work with electricity and circuits are based on 9 volt batteries. Often they start by having the experimenter place a resistor in series with the LED to reduce current flow, save on battery life and keep the LED from getting fried. Having to use a...
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