Two 100w light bulbs used a total of 400wh of energy. For how many hours did the light bulbs use power?
Mathematics
CorneliusWragg
Question
Two 100w light bulbs used a total of 400wh of energy. For how many hours did the light bulbs use power?
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1. User Answers apologiabiology
I'm assuming that you meant to write 'two 100w per hour light bulbs used a total of 400w. how many hours did the bulbs run'
so each used 100w per hour and there are 2 light bulbs so in 1 hour 200w is used
200wh times x hour=200wx=400w
divide both sides by 200w
x=2
they ran for 2 hours