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A schematic rheostat is shown in figure....

A schematic rheostat is shown in figure. Connect a battery to it so that it acts as a potential divider. Also show the output terminals.

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The circuit for rheostat used as potential divider is shown in figure. The out put voltage is obtained asross A and C. In this case, the output voltage is `V = ((epsilon)/(R+r))R/l x`
Where `l` is the length AB of resistance R and x is the length of resistance tapped for output. `epsilon` is the emf of battery used and r is the internal resistance of the cell.
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