Posted 02-05-2005 at 17:35:43
[Reply] [No Email]
The easiest way to think about electricity is to think as if it were water flowing in pipes.
So if L1 is hooked to one wire on your pump and L2 is hooked to the other, just like water running thru a pump, the same amount going in MUST come out the other side.
Now a step-up transformer will work just like Illinios said. So the use the water anaology again, we need to think of a transformer as a water pump hooked to a water (hydraulic) motor. BUT in this case the pressure of the pump is twice that of the motor. So the motor has to be geared up, by two in your case, meaning that the motor has to turn twice as fast as the pump. That would require that the water in the motor flow twice as fast. That is the 20 amps of 110V to get 10 amps of 220V.
Now if the pump and motor were connected to a "cross" (a fitting with four connections) it would look like a transformer with a common terminal for the two windings. BUT the flow rate in each pipe loop is only determined by the things in that loop since water that might try to go in to the other loop would be stopped because there is no way for it to get back. It cannot go in and out the same "hole", just does not work.