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  4. For a cell, a graph is plotted between the potential difference V across the terminals of the cell and the current I drawn from the cell (see figure). The emf and the internal resistance of the cell are E and r , respectively Then <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/8a30febd1d1c8d21acfc03ef61c70a68-.png />

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Q. For a cell, a graph is plotted between the potential difference $V$ across the terminals of the cell and the current $I$ drawn from the cell (see figure). The emf and the internal resistance of the cell are $E$ and $r$ , respectively Then
image

Current Electricity

Solution:

$V =E -ir$ When $i=0$, the potential reading is 2 V. Hence emf is $2\,V$ When $V=0, i =5\,A$ This gives $r =0.4 \,\Omega$