A battery of emf 12 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, a] Calculate resistance of resistor. b] Calculate terminal voltage of the battery when the circuit is closed.

 

A battery of emf 12 V and internal  resistance 3 Ω is connected to a resistor.  If the current in the circuit is 0.5 A,  a] Calculate resistance of resistor.  b] Calculate terminal voltage of the  battery when the circuit is closed.