A flashlight contains two batteries in series each having a potential difference of 1.5V and an internal resistance of 0.2 ohms ( which is represented in series with the battery. The bulb has a resistance of 22 ohms
a) Draw a circuit diagram of the flashlight.
b) What is the current through the bulb.
c) How much power does the bulb dissipate.
d) How much greater would the power be if the batteries had no internal resistance.