A battery of internal resistance `2 Omega` is connected to a variable resistor whose value can vary from `4 Omega` to `10 Omega`. The resistance is initially set at `4 Omega`. If the resistance is now increased then

Options

A. power consumed by it will decrease
B. power consumed by it will increase
C. power consumed by it may increase or may decrease
D. power consumed will first increase then decrease

Answer

A

Explanation

(a) `P = I^(2) R = ((V)/(R ))^(2) R = (epsilon^(2))/((R + r)^(2)) R`
`epsilon` is constant and `(R + r)` increases rapidly then `P darr`