Find the potential difference between points | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The circuit consists of two cells of $EMF$ $6 \ V$ and $4 \ V$ connected in opposition,and two resistors of $2 \ \Omega$ and $8 \ \Omega$ in serie

Vedclass · Accepted Answer

$5.6$

Vedclass · Answer

(B) The circuit consists of two cells of $EMF$ $6 \ V$ and $4 \ V$ connected in opposition,and two resistors of $2 \ \Omega$ and $8 \ \Omega$ in series.Net $EMF$,$E_{net} = 6 \ V - 4 \ V = 2 \ V$.Total resistance,$R_{total} = 2 \ \Omega + 8 \ \Omega = 10 \ \Omega$.The current in the circuit is $I = \frac{E_{net}}{R_{total}} = \frac{2 \ V}{10 \ \Omega} = 0.2 \ A$.To find the potential difference between $A$ and $B$,we move from $A$ to $B$ through the $4 \ V$ cell and the $8 \ \Omega$ resistor.The potential difference across the $8 \ \Omega$ resistor is $V_R = I 	imes R = 0.2 \ A 	imes 8 \ \Omega = 1.6 \ V$.Moving from $A$ to $B$,we encounter the $4 \ V$ battery (from positive to negative terminal,so potential drops) and the resistor (potential drops in the direction of current).$V_A - V_B = 4 \ V + (I 	imes 8 \ \Omega) = 4 \ V + 1.6 \ V = 5.6 \ V$.

Find the potential difference between points $A$ and $B$ in the following circuit. (in $V$)

Similar Questions

The resistances in the following circuit are $R_1 = R_2 = R_3 = 6.0 \ \Omega$. The emf of the battery is $12 \ V$. When switch $S$ is closed, the potential across resistance $R_1$ changes by an amount:

Two wires made of the same material have lengths in the ratio $2: 3$ and radii in the ratio $8: 9$. If the same potential difference is applied across the ends of the wires,the ratio of the electric currents flowing through them is

In the circuit shown below,the current that flows from $a$ to $b$ when the switch $S$ is closed is ............... $A$.

$A$ series combination of two resistors $1\,\Omega$ each is connected to a $12\,V$ battery of internal resistance $0.4\,\Omega$. The current flowing through the circuit will be ............... $A$.

In the circuit shown,the cell has $emf = 10\,V$ and internal resistance $= 1\, \Omega$. Find the current through the $4\, \Omega$ resistor.

Vedclass Test Series

Exam Paper Generator

Online Exam Module