(C) The terminal potential difference $V$ across a battery is given by $V = E - Ir$,where $E$ is the $emf$ and $r$ is the internal resistance.From the

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The $emf$ of the battery is $1.5 \, V$ and its internal resistance is $1.5 \, \Omega$.

(C) The terminal potential difference $V$ across a battery is given by $V = E - Ir$,where $E$ is the $emf$ and $r$ is the internal resistance.From the graph,when the current $I = 0$,the voltage $V = E = 1.5 \, V$.When the current $I = 1000 \, mA = 1 \, A$,the voltage $V = V_0 \approx 0 \, V$.Substituting these values into the equation $V = E - Ir$:$0 = 1.5 - (1 \, A) \times r$$r = 1.5 \, \Omega$.Thus,the $emf$ of the battery is $1.5 \, V$ and its internal resistance is $1.5 \, \Omega$.

Class 12 Physics Current Electricity Circuit Solving for current and Voltage

Medium

To verify Ohm's law,a student connects the voltmeter across the battery as shown in the figure. The measured voltage is plotted as a function of the current,and the following graph is obtained. If $V_0$ is almost zero,identify the correct statement.

JEE MAIN 2019 All JEE MAIN

A
The potential difference across the battery is $1.5 \, V$ when it sends a current of $1000 \, mA$.
B
The $emf$ of the battery is $1.5 \, V$ and the value of $R$ is $1.5 \, \Omega$.
C
The $emf$ of the battery is $1.5 \, V$ and its internal resistance is $1.5 \, \Omega$.
D
The value of the resistance $R$ is $1.5 \, \Omega$.

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Medium

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To verify Ohm's law,a student connects the voltmeter across the battery as shown in the figure. The measured voltage is plotted as a function of the current,and the following graph is obtained. If $V_0$ is almost zero,identify the correct statement.

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The potential difference across $A B$ in the network shown is .........

An electric bulb rated for $500\, W$ at $100\, V$ is used in a circuit having a $200\, V$ supply. The resistance $R$ that must be put in series with the bulb,so that the bulb draws $500\, W$,is ................. $\Omega$.

$A$ current source drives a current in a coil of resistance $R_1$ for a time $t$. The same source drives current in another coil of resistance $R_2$ for the same time. If the heat generated is the same,find the internal resistance of the source.

In the adjoining circuit shown,the potential difference between points $A$ and $B$ will be:

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