No Idea how to work this out! -- Charging and discharging an iPod 1. The problem statement, all variables and given/known data It takes about 5 hours for a fully charged ipod nano to run out of power when its screen is left on and all other functions are switched off. Subsequently, it takes about 90 minutes to recharge the ipod from a charging unit with a 5V and 500mA output. The same ipod takes about 24hours to run out of power when only the audio function is used a) calculate the power consumption of the screen and audio output seperately b) calculate when the power will run out if the user switches on the screen for 10 seconds every 3mins (i.e. about once every track) assuming the ipod is fully charged at the start. 2. Relevant equations 3. The attempt at a solution I dont know where to start with this question been stuck on it for hours and cant get anything from it :( please help!!