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posted by  wakebrdr3 on 6/5/2007 5:23:14 PM  |  status: Live  

Simple question

Course Textbook Chapter Problem
Algebra Based Physics College Physics (7th) by Serway, Faughn, Bennett 17 13
Question Details:
A light bulb hasa resistance of 250 ohm when operating at a voltage of 100 V. What is the current in the bulb?

I used the following formula: I = delta V/ R and got the answer 0.4 A. I need to put the answer in mA. I thought that it would be .4 x 10^-2 but this is not right. What is the correct way to do this? Thanks so much for helping!

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posted by ryguy on 6/5/2007 5:56:29 PM  |  status: Live
Asker's Rating: Lifesaver   
wakebrdr3's comment:
"Great help "
Response Details:
Your answer is correct.... I = ΔV / R = 100 V / 250 Ω = 0.400 A
 
But many times these types of questions will ask for milli (sp?) amps, so your answer would be
 
                     I = 400 mA
 
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