A cell of emf `epsilon` and internal resistance `r` is connected across a variable load resistance `R`. It is found that when `R = 4 Omega` the current is `1A ` and when `R` is increased to `9 Omega`, the current reduces to `0.5A`. Find the value of the emf `epsilon` and internal resistance`r`

Explanation

`5 V and 1 Omega`