(B) Given: $E = 4\, V$,$R = 2\, \Omega$,$I = 1\, A$.Using Ohm's law for the circuit: $I = \frac{E}{R + r}$.Substituting the values: $1 = \frac{4}{2 +

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(B) Given: $E = 4\, V$,$R = 2\, \Omega$,$I = 1\, A$.Using Ohm's law for the circuit: $I = \frac{E}{R + r}$.Substituting the values: $1 = \frac{4}{2 + r}$.$2 + r = 4 \Rightarrow r = 2\, \Omega$.When the terminals are connected directly,it is a short circuit condition where the external resistance $R = 0$.The short circuit current is given by: $I_{SC} = \frac{E}{r}$.$I_{SC} = \frac{4}{2} = 2\, A$.

Class 12 Physics Current Electricity Circuit Solving for current and Voltage

Easy

$A$ battery has an $e.m.f.$ of $4\, V$ and an internal resistance $r$. When this battery is connected to an external resistance of $2\, \Omega$,a current of $1\, A$ flows in the circuit. How much current will flow if the terminals of the battery are connected directly?

A
$1\, A$
B
$2\, A$
C
$4\, A$
D
Infinite

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Current Electricity

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Circuit Solving for current and Voltage

In the circuit shown,the readings of the ammeter and voltmeter are $4\,\, A$ and $20\,\, V$ respectively. The meters are non-ideal. Then $R$ is

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Two bulbs $X$ and $Y$ have the same voltage rating and their power ratings are $40 \ W$ and $60 \ W$ respectively. They are connected in series to a $300 \ V$ battery as shown in the figure. Then:

Easy

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$A$ battery with an internal resistance of $4\,\Omega$ is connected to a circuit as shown in the figure. For the circuit to receive maximum power,the value of $R$ should be ..... $\Omega$.

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Find the power of the circuit in $W$.

Easy

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In the given circuit,the resistance of the voltmeter is $10,000\, \Omega$ and the resistance of the ammeter is $20\, \Omega$. The ammeter reading is $0.1\, \text{A}$. If the voltmeter reading is $12\, \text{V}$,then the value of $R$ is ............ $\Omega$.

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$A$ battery has an $e.m.f.$ of $4\, V$ and an internal resistance $r$. When this battery is connected to an external resistance of $2\, \Omega$,a current of $1\, A$ flows in the circuit. How much current will flow if the terminals of the battery are connected directly?

Similar Questions

In the circuit shown,the readings of the ammeter and voltmeter are $4\,\, A$ and $20\,\, V$ respectively. The meters are non-ideal. Then $R$ is

Two bulbs $X$ and $Y$ have the same voltage rating and their power ratings are $40 \ W$ and $60 \ W$ respectively. They are connected in series to a $300 \ V$ battery as shown in the figure. Then:

$A$ battery with an internal resistance of $4\,\Omega$ is connected to a circuit as shown in the figure. For the circuit to receive maximum power,the value of $R$ should be ..... $\Omega$.

Find the power of the circuit in $W$.

In the given circuit,the resistance of the voltmeter is $10,000\, \Omega$ and the resistance of the ammeter is $20\, \Omega$. The ammeter reading is $0.1\, \text{A}$. If the voltmeter reading is $12\, \text{V}$,then the value of $R$ is ............ $\Omega$.

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