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Saturday, 4 March 2017

Current Electricity - V


Potentiometer:

The potentiometer is a device to compare potential differences. Since the method involves a condition of no current flow, the device can be used to measure potential differences; internal resistance of a cell and compare emf’s of two sources.
Potential Gradient:
The potential gradient of the wire in a potentiometer depends on the current in the wire.
If an emf Î 1  is balanced against length l 1 , then Î 1 = rl 1
Similarly, if Î 2  is balanced against l 2  , then Î 2 = rl 2
The comparison of emf’s of the two cells is given by,
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