Question

A battery of emf 10V and internal resistance 0.5 ohm is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by :

• A. 0.5 ohm
• B. 1.0 ohm
• C. 2.0 ohm
• D. 0.25 ohm

Answer 1

Answer: (A)

0.5 ohm

Answer 2

We know that for obtaining maximum power, the internal resistance must be equal to variable resistance so, the value of R will $0.5\,\Omega$ .