Posted by natali on .
A 100W light bulb is left on for 10hrs. Over this period of time how much energy is used by the bulb?
am i doing this right?
my guess is to convert 100W to kW
and convert 10 hrs to seconds and multiply the 2 together?
which gives 3600J or should i just leave it in watts?

physics 
bobpursley,
Energy is in joules. Power is in watts.
Sometimes electrical energy is spoken of as watthours, or wattseconds, or kwhrs. But in the end, joules is energy.
Multiply watts x time to get energy.