| CURRENT - WATER FLOW ANALOGY | ||
Two water tanks connected by a pipe and valve provide a current flow analogy. At first, the valve is closed and all the water is in tank A. This situation compares to an electron sitting alone and holding a negative charge. When the valve is opened, the water flows through the pipe from A to B until the water level becomes the same in both tanks. The water then stops flowing in the pipe since the water pressure between the two tanks is now equal. Similarly, if a higher energy electron contacts a lower energy one, electrons ‘flow’ from the positive atom to the negative atom. The current flow stops, just as our water flow did, when both charges are equivalent. |
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