A battery with an emf of 12.0 V shows a terminal voltage of 11.8 V when operating a circuit with four light bulbs each rated at 4 W (at 12.0 V) which are connected in parallel.
(a) Draw a diagram of the arrangement.
(b) What is the total external resistance of this circuit?
(c) What is the current in each bulb?
(d) What is the internal resistance of the battery?