Question

A resistor of resistance ' $R$ ' is connected between the terminals of a cell of emf ' $E$ ' andinternal resistance ' $r$ '. If '$I$' is the current through the circuit. The terminal potential difference of the cell is given by

• A. $I R$
• B. $E-I r$
• C. $\frac{E R}{R+r}$
• D. $\frac{E-R}{r}$

Answer 1

Answer: (B)

Cell of $\operatorname{emf} E$ and internal resistance $r$ is connected with resistor of resistance $R$ as shown in the figure.

When cell is discharging, then terminal potential difference across the cell is given as $V=E-I r$ where, $I=$ current drawn by cells.