Question

the internal resistance of a 2.1 v cell which give a current of 0.2 A through a resistance of 0.5 ohm is​

Answer 1

Answer:

Internal Resistance(r) = 10Ω

Explanation:

Given,

Voltage(V) = 2.1 V

Current(I) = 0.2 A

External Resistance(R) = 0.5Ω

To Find :-

Internal Resistance(r)

Formula Required :-

V = I(R + r)

Solution :-

2.1 = 0.2(0.5 + r)

2.1/0.2 = 0.5 + r

10.5 = 0.5 + r

10.5 - 0.5 = r

r = 10Ω

Internal Resistance(r) = 10Ω