How many kw-hr are consumed by twenty-five 60 watts light bulbs burning 5 hrs. in a 12v
circuit?
The total power dissipated on the bulbs
"P=NP_0=25*60\\:\\rm W=1500\\: W"The amount of electricity
"W=Pt\\\\\n=1500\\:\\rm W*5\\: hr=7500\\: W\\cdot hr=7.5\\: kW\\cdot hr"
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