FYKOS Year 33 Series 1 Problem 2 — battery issue on holidays · FYKOS 33 #33.1.2
Physics · electromagnetism · optics
Problem
How long does it take for a fully charged car battery (12V, 60Ah) to run out, when someone forgets to turn off the daytime
running lights, locks the car and walks away? Specifically we are interested in a situation with two head lights H4 (each running with 55W)
and two rear lights P21/5W (each running with 5W). For simplicity, assume no transport losses between the battery and the lights, that
there is no other significant consumption of power and that the voltage on the battery stays constant.