(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.

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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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Circuit Solving for current and Voltage

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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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Resistances of $6\, \Omega$ each are connected in the manner shown in the adjoining figure. With the current $0.5\, A$ as shown in the figure, the potential difference $V_P - V_Q$ is .............. $V$.

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The storage battery of a car has an $emf$ of $12\; V$. If the internal resistance of the battery is $0.4\; \Omega,$ what is the maximum current (in $A$) that can be drawn from the battery?

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