Question

Calculate the internal resistance of a cell of emf 1.5v that is connected in series with a resistance of 7ohms and ammeter resistance of 5ohms if the current is 0.1A

Answer 1

Answer:

3 ohm

Explanation:

R = V / i and for series comb. R = R1+R2+......+Rn

using this

Total resistance of the circuit

= (7+5+r) = 1.5 / 0.1

=> 12+r = 15

=> r = 15-12

=> r = 3 ohm

Hope this helps you