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A Variable Resistor R is Connected Across a Cell of Emf ε and Internal Resistance R as Shown in the Figure. Draw a Plot Showing the Variation of - Physics

Short Note

A variable resistor R is connected across a cell of emf ε and internal resistance r as shown in the figure. Draw a plot showing the variation of
(i) Terminal voltage V and
(ii) the current I, as a function of R.

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Solution

(i) Terminal voltage across a cell as a function of R

As resistance R increases current (I) in the circuit decreases and terminal voltage (V) increases.

We know V = ε –Ir; Where ε is emf of the cell


(ii)
Current I as a function of R.

The current across a cell is given by `"I" = epsilon/("R"+"r")`

When R increases I decreases

Concept: Temperature Dependence of Resistance
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