A primary cell has an e.m.f. of 1.5 volt. When 5Ω resistance is connected in the circuit, it gives a current of 0.2 ampere. The internal resistance of the cell is

Question

A primary cell has an e.m.f. of 1.5 volt. When 5Ω resistance is connected in the circuit, it gives a current of 0.2 ampere. The internal resistance of the cell is (A) 0. 5 ohm (B) 1.25 ohm (C) 2.5 ohm (D) 5 ohm.

Tardigrade Admin · Accepted Answer

E = I [R + r] Here E = 1.5 V , I = 0.2 A, R = 5 Ω Hence r = 2.5 Ω

Q. A primary cell has an e.m.f. of $1.5 v o lt$ . When $5Ω$ resistance is connected in the circuit, it gives a current of $0.2 am p ere$ . The internal resistance of the cell is

0. 5 ohm

1.25 ohm

2.5 ohm

5 ohm.

E = I [R + r]
Here E = 1.5 V , I = 0.2 A, R = 5 $Ω$ Hence r = 2.5 $Ω$

Q. A primary cell has an e.m.f. of 1.5volt. When 5Ω resistance is connected in the circuit, it gives a current of 0.2ampere. The internal resistance of the cell is