In order to find a DC motor you can check Ebay, or look for inexpensive power tools. Drills, screwdrivers and other tools are a great way to find inexpensive DC motors although they do not generate much energy they are great for smaller projects.
So how do DC motors work as a power generator? Usually a DC motor will use power, but when we spin the motor in the opposite direction it will actually generate power. The power will go back out the same wires where the power usually comes in from. It's very simple which is why DC motors are perfect for our DIY wind generator.
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