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HEATING FILAMENT WILL RATE LIFESAVER!!!

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Pupil
Karma Points: 50
Respect (100%):
Date Posted: 5/14/2008 3:07:16 AM  Status: Closed
HEATING FILAMENT WILL RATE LIFESAVER!!!
Course Textbook Chapter Problem
N/A HOW THINGS WORK 10.3 27
Question Details:

How much current flows through a 130-Ω heating filament when the voltage drop across it is 4 V? Round the answer to 3 significant digits.


    A
 
ANSWER IS NOT:
520 A
32.4 A
0.0307 A
0.031 A
 
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Answers:

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Sage
Karma Points: 6,136
Date Posted: 5/14/2008 3:14:26 AM  Status: Live
Asker's Rating: Lifesaver   
Response:
use Ohm's Law:
    V = IR

here, V = 4V, R = 130Ω

    ∴ I = V/R
          = 4V / 130Ω
          = 0.0308A

the current flowing through the filament is 0.0308A
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