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Anonymous Poster

Ohm's law

01/17/2009 5:13 AM

Hi

According to Ohm's law which states that there's a direct proportion between the applied voltage through a conductor and the measured current passing that conductor…Is the law constant for any calculations in relevant to electrical devices installation, or there're exceptions for putting it into effect ( please state them )

V α I " Ohm's law

V = R . I

Whereas :

V: the applied voltage.

I : the current

R : a constant that represents the material resistance .

as I read about something which made me confused a bit , so I need your opinions , particularly the scientific ones about Ohm's law …
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sb
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Join Date: Mar 2007
Posts: 2550
Good Answers: 103
#1

Re: Ohm's law

01/17/2009 5:26 AM

what has confused you ?

This language clearly looks like a question paper/ homework assignment. Such a nice concise and to the point question has to be framed by a professor only.

To the point, no ambiguity. The answere is yes and no.

Why don't you think about it and try to solve them? Since this is a question put up as assignment you have to be an Electrical Engg student and it has been covered in your syllabii (both the yes and no parts) at different places.

I feel your answer is in this link here

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tropicalspeed
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Join Date: Jan 2009
Location: Currently on break at home in Houston, Texas USA
Posts: 268
Good Answers: 20
#2

Re: Ohm's law

01/17/2009 9:07 AM

Yes, Ohms law is relevant in any circuit where a DIRECT CURRENT is present. In a DC circuit, power is also expressed by: P=E x I

Where:

P= True Power in Watts

E= applied DC Voltage

I= Current in Amps

Ohms law is not entirely applicable in a circuit containing an ALTERNATING CURRENT. It will hold true only if the current load in the circuit is purely resistive. If the circuit contains capacitance or inductance, then impedance calculations need to be used instead.
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