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It's not really that one or the other - series or parallel - connections are more efficient than each other. In series connections, voltage increases. In parallel connections, current or capacity increases. However, with DC motors, speed is proportional to voltage. Therefore, connecting your batteries in series is the preferred way to go. You get a higher voltage, thus higher top speed from your motor. Also, higher voltage means lower current draw for the same amount of power. Lower current means that you can use thinner cabling, which is less expensive, easier to work with, and saves weight.
The designs vary a bit. Some of the earlier ones are pretty simple - good to keep a little kid busy for a few minutes. The designs that are more detailed are great for adults. Those are better when you have some quiet time to yourself, and DO take a while!
Absolutely! Great link.
Medieval Coloring BookView Instructable »
I TOTALLY want to see someone make Castle Grayskull!!!
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