Question

The emf of a cell 2 volt . When it is connected to a 25 ohms of resistor ,the terminal voltage of cell is found to be 1.8 volt .What is the internal resistance of the cell and the current in 25 ohms resistor​

Answer 1

Answer:

r = 0.04 ohm

Explanation:

Vt = 1.8 v

E = 2 v

R = 25 ohm

I = E / R

I = 2 / 25 = 0.08 A

r = ?

Vt = E - Ir

1.8 = 2 - 0.08 r

1.8 -2 = - 0.08 r

- 0.2 = - 0.08 r

r = 0.04 ohm