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posted by  mathew on 6/9/2007 9:29:42 PM  |  status: Live  

electric charges forces and fields

Course Textbook Chapter Problem
N/A physics 3rd edition JAMES S WALKER N/A N/A
Question Details:
A fresh D cell battery can provide about  5000 joule electrical energy  before it must be discarded . Estimate the number of coulombs that must pass through it  during its lifetime?
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(Ecole Polytechnique Fédérale de Lausanne)
posted by Golden Monkey on 6/9/2007 9:35:51 PM  |  status: Live
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Response Details:
A D cell is 1.5 volts and the energy is charge times voltage or
 
   E  =  q V       q  = E / V  =  5000 Joule / 1.5 volt  =   3333 coulombs
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posted by JERRY on 6/11/2007 6:57:17 PM  |  status: Live
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mathew's comment:
"thankuu"
Response Details:
E = qv, q = E /v =5000J / 1.5V = 3333 C
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