there are 60*60 = 3600 seconds/hr
2000 hr *3600 s/hr = 72*10^5 s
times 100 watts = 72*10^7 Joules
720 million Joules :)
A 100 watts light bulb has an average life of 2000 hours. How much energy does it consume over its lifetime?
The only thing I got was power=100 watts and time = 2000 hours but I need to convert to seconds and I don't kn how to do that.
2 answers
If you want to do that, 3600sec/hr.
However, the problem did not state the units of power. If you use Kw-hr, the problem is simple:
energy=.1 kw * 2000hrs=200kw-hr
However, the problem did not state the units of power. If you use Kw-hr, the problem is simple:
energy=.1 kw * 2000hrs=200kw-hr
1 answer