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Originally Posted by BrianG
Well, it's because you are changing the motors from parallel to series. The resistance is changing by a factor of 4.
So, just to make up some easy numbers, let's say each motor has 10 ohms. In parallel, that's 5 ohms. With 20v (again, some easy arbitrary number), that's 4A for 80W.
Now, put those motors in series instead and you have 20 ohms. That's only 1A and 20W.
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Oh yeah, I know what you mean now. I forgot about there being less resistance of two parralel motors compared to one.
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