(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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Class 12 Questions

Class 12

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Current Electricity

Subtopic

Circuit Solving for current and Voltage

Find the voltage $V_2$ across $R_2$ for the given circuit. (in $V$)

DifficultTS EAMCET 2018

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Two wires $A$ and $B$ made of the same material and having their lengths in the ratio $6 : 1$ are connected in series. The potential differences across the wires are $3\,V$ and $2\,V$ respectively. If $r_A$ and $r_B$ are the radii of $A$ and $B$ respectively,then $\frac{r_B}{r_A}$ is

Medium

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$A$ copper wire of radius $0.1 \text{ mm}$ and resistance $2 \text{ k}\Omega$ is connected across a power supply of $40 \text{ V}$. The number of electrons transferred per second between the supply and the wire at one end is

DifficultAP EAMCET 2020

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$A$ parallel combination of two resistors,of $1 \,\Omega$ each,is connected in series with a $1.5 \,\Omega$ resistor. The total combination is connected across a $10 \,V$ battery. The current flowing in the circuit is .............. $A$

Easy

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In the adjoining circuit,the potential difference across $3\,\Omega$ is ................ $V$.

Medium

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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

Find the voltage $V_2$ across $R_2$ for the given circuit. (in $V$)

Two wires $A$ and $B$ made of the same material and having their lengths in the ratio $6 : 1$ are connected in series. The potential differences across the wires are $3\,V$ and $2\,V$ respectively. If $r_A$ and $r_B$ are the radii of $A$ and $B$ respectively,then $\frac{r_B}{r_A}$ is

$A$ copper wire of radius $0.1 \text{ mm}$ and resistance $2 \text{ k}\Omega$ is connected across a power supply of $40 \text{ V}$. The number of electrons transferred per second between the supply and the wire at one end is

$A$ parallel combination of two resistors,of $1 \,\Omega$ each,is connected in series with a $1.5 \,\Omega$ resistor. The total combination is connected across a $10 \,V$ battery. The current flowing in the circuit is .............. $A$

In the adjoining circuit,the potential difference across $3\,\Omega$ is ................ $V$.

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