Electric Circuits EMF

  • Thread starter Sarliz
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Homework Statement



You'll have to forgive me... I've got some rather poor Physics books with which to consult, so this may seem rather simple. I think I understand the concepts but I don't think I have all of the information from my sources to answer this problem.

A 1.5 V battery stores 4.3 kJ of energy. How long can it light a flashlight bulb that draws 0.6A?

Units should be in hours, but I'm not sure what to do with only having equations V = IR and I = E/R (where E is epsilon, of course). I don't know what part of this factors into time!!!
 

Answers and Replies

  • #2
Kurdt
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The electric power in a DC circuit is [itex] P =IV [/itex]. Is that enough to get you going?
 
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The electric power in a DC circuit is [itex] P =IV [/itex]. Is that enough to get you going?
Guess it'll have to be. Thanks.
 
  • #4
Kurdt
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Guess it'll have to be. Thanks.
If you have more questions I'll be happy to clarify :smile:

The units of power are of course Joules/second. That is where the time comes into it.
 

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