Question

When a 4V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. The value of the resistance of the resister is: 

(i) 4 Ω 

(ii) 40 Ω 

(iii) 400 Ω 

(iv) 0.4 Ω

Answer 1

(ii) = 40 Ω. V=IR, 

V = 4V, I = 100 mA = 0.1 A 

Hence R = V/I = 4/0.1 Ω = 40 Ω.

Comments

right answer