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An incandesent light bulb has a resistance of 240 `Omega` when lighted. What is the...

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littlecomet1992 | Student, Undergraduate | (Level 3) eNoter

Posted June 2, 2013 at 6:15 PM via web

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An incandesent light bulb has a resistance of 240 `Omega` when lighted. What is the current when connected to a 120 V source?

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ishpiro | Teacher | (Level 2) Associate Educator

Posted June 2, 2013 at 7:25 PM (Answer #1)

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The relationship between the current, voltage and resistance is known as Ohm's Law:

`V = I*r` , where V is voltage, i is current and r is resistance.

Therefore the current through the 240 `Omega` bulb connected to 120-Volt source is

`I=V/r = (120 V)/(240 Omega) = 0.5` Amp

The current is 0.5 Amps.

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