A battery of emf 12 V and internal resistance 4 is connected to an external resistance R. If the current in the resistance is 0·5 A, calculate the value of (a) R,
A battery of emf 12 V and internal resistance 4 is connected to an external resistance R. If the current in the resistance is 0·5 A, calculate the value of (a) R, and (b) the terminal voltage of the battery.