Two identical lamps, P and Q, are in a single closed loop with a battery. A student says that lamp Q will be dimmer than lamp P, because some of the current is used up in lamp P.
Give the current in lamp Q when the current in lamp P is 0.45 A.
Explain why the student's idea is wrong.
The battery is replaced by one with a larger potential difference. Describe the effect on the current in the two lamps.