Question

The potential difference in open circuit for a cell is 2.2 volts. When a 4 ohm resistor is connected between its two electrodes the potential difference becomes 2 volts. The internal resistance of the cell
will be
1) 1 ohm
2) 0.2 ohm
3) 2.5 ohm
4) 0.4 ohm
explain in detail​

Answer 1

Answer:4.0.4ohm

Explanation:

Internal resistance r=Emf-voltage/voltage*resistance

Emf is electro motive force

Which is a voltage applied on open circuit