Which equation do i use to figure out these electrical energy questions?
300mAh means it can supply 300mA for an hour, if the voltage is 3.6v then the power out at 300mA is 0.3 X 3.6 = 1.08W The definition of a watt is joules per second and joules in energy so the total energy must be 1.08X3600 = 3888J (3600 seconds in an hour not 60, brain fade) I think you will now be able to do question two just remember that if it can supply 300mA for one hour it can do 150mA for two hours etc. The number of hours and the current multiplied is a constant. Most of this came down to understanding the units not which equation to use.
