Ohm's Law

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praveen2011 Member Join Date: Jul 2011 Posts: 6	Ohm's Law 08/01/2011 4:34 AM
	can any one derive V= IR
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Anonymous Poster #1	#1 Re: ohm's law 08/01/2011 4:36 AM
	http://en.wikipedia.org/wiki/Ohm%27s_law
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Fredski Guru Join Date: Feb 2011 Posts: 7025 Good Answers: 207	#2 Re: ohm's law 08/01/2011 6:43 AM
	V = volts I = amps R = resistance
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Anonymous Poster #2	#3 Re: Ohm's Law 08/01/2011 9:24 AM
	Lets say If Resistance of an electric iron is 50 Ω and 4.2A Current flows through the resistance. Find the voltage between two points. Solution: Here, Resistance, R = 50 Ω. Current, I =4.2 A Voltage, V =? From Ohm's law, V = IR = 4.2 × 50 = 210V Ans: 210V.
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msamad Guru Join Date: Feb 2009 Location: Houston, USA Posts: 946 Good Answers: 244	#4 Re: Ohm's Law 08/01/2011 10:08 PM
	parveen2011, Welcome to CR4 - a good learning forum for engineering professionals. All the questions that you posted here is very basic of electrical engineering. http://cr4.globalspec.com/search/sitesearch?do=show&us=50492 I would suggest you to get a book of basic electrical engineering or take a course. CR4 is not expecting question from a learner of basic engineering theory. - MS __________________ "All my technical advices in this forum must be consulted with and approved by a local registered professional engineer before implementation" - Mohammed Samad (Linkedin Profile: http://www.linkedin.com/in/msamad)
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#5 Re: Ohm's Law 08/01/2011 11:24 PM
	This may be more of a semantic or philosophical question, rather than technical. I doubt that this formula is derived; it may have been empirically observed, or even just defined. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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soebfatehi Power-User Join Date: Jun 2009 Posts: 223 Good Answers: 15	#6 Re: Ohm's Law 08/02/2011 2:58 AM
	please get a copy of a text book on Electrical Engineering by H.Cotton . . . read any other book in addition if you have time . . .
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amith Commentator Join Date: Jan 2011 Location: India Posts: 69	#7 Re: Ohm's Law 08/02/2011 9:24 AM
	Dear Praveen2011, Nice question... See V=I*R is not a derivation, it is law... this law or equation made depends on practical test & verification... As my knowledge there is no derivation for this.., With regards, Amith Raj
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soebfatehi Power-User Join Date: Jun 2009 Posts: 223 Good Answers: 15	#8 Re: Ohm's Law 08/02/2011 9:34 AM
	read . . . http://people.seas.harvard.edu/~jones/es154/lectures/lecture_2/drude_model/drude_model.html http://www.electronicspoint.com/proof-ohms-law-t109248.html
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amith (1); Anonymous Poster (2); Fredski (1); msamad (1); soebfatehi (2); Tornado (1)

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