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Standard XII

Physics

EMF and EMF Devices

A cell having...

Question

A cell having an emf $ε$ and internal resistance r is connected across a variable external resistance R. As the resistance R increases, the plot of potential difference V across R is given by.

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Solution

$i = \frac{ε}{r + R}$

$v = i R = \frac{ε R}{r + R}$

$v = \frac{ε}{1 + \frac{r}{R}}$
here, $r = c o n s t a n t$

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A cell having an emf ε and internal resistance r is connected across a variable external resistance R. As the resistance R increases, the plot of potential difference V across R is given by.

i=εr+Rv=iR=εRr+Rv=ε1+rR here, r=constant

A cell having an emf $ε$ and internal resistance r is connected across a variable external resistance R. As the resistance R increases, the plot of potential difference V across R is given by.

$i = \frac{ε}{r + R}$

$v = i R = \frac{ε R}{r + R}$

$v = \frac{ε}{1 + \frac{r}{R}}$
here, $r = c o n s t a n t$