Question

In the given circuit cell E has internal resistance of r = 2Ω. What is the value of resistance R so that power delivered to resistor R is maximum?

(A) 1Ω

(B) 2Ω

(C) 3Ω

(D) 5Ω

Answer 1

Correct option (D) 5Ω  

Explanation:

Since equivalent internal resistance of equivalent cell across the external resistor R is 2+3 = 5 Ω, Hence power delivered to R will be maximum if R =5 Ω.