In circuit analysis, current, voltage and resistance and their interdependence play a vital rule. The relationship among them is called Ohm's Law. It was named after the scientist who expressed it first. This law can be denoted by three formulas:
V=IR
I =V/R
R =V/I
Where V stands for voltage, I for current and R for resistance.
One have to remember only one and he/she can derive the others by simple mathematics.
Ohm's Law can be represented by a triangle, as shown in the figure. One can cover the required one to get the relationship between them.
For example, we know E and I, and wish to determine R, we have to just cover R from the picture and see what's left:
Suppose, we know E and R, and wish to determine I, we have to just cover I from the picture and see what's left:
Lastly, if you we know I and R, and wish to determine E, we have to just cover E from the picture and see what's left:
Mr. Muhammad Saqib, M.Sc. (PAK), Research Fellow (PAK), a member of IEEE, is a Fulbright Alumnus and earned his Master’s Degree in Electrical and Power Engineering from University Of Engineering And Technology Taxila, PAKISTAN.
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