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Ohms Law is the basic of anything that has something to do with electrical engineering and electricity. It is a mathematical expression of the relationship between, the current, voltage, and resistance. Every equation and law in electrical engineering would be explained at the simplest sense, and would all boil down to Ohm's Law.

Ohms Law states that the current is directly proportional to the impressed emf applied to the circuit, and is inversely proportional to the resistance of the said circuit. This mathematical equation is conveniently represented by only three letters:

I = E/R

Where;

I - current

E - voltage

R - resistance

Ohms Law was named after one of our Electrical Engineering Heroes, Georg Simon Ohm.

**OHMS LAW CALCULATOR Applet**
**Ohm's Law Components**
Current or electric current is the motion of the electrical charges brought upon by a potential difference. It's unit is in ampere, named after Andre M. Ampere. One (1) ampere unit is equivalent to one coulomb of charge, passing a point in one second.

Impressed Electromotive Force (EMF), also called as Potential Difference, or simply voltage, is the capability of doing work, expressed in Volts. It is named after Alessandro C. Volta. One (1) unit of volt is equal to one Joule of work done per coulomb of charge.

Resistance is the inherent opposition of the conductor where the work (one joule per coulomb) has to be done. Factors that determines the resistance aside may be its resistivity, area, length, and temperature.

**Ohm's Law Sample Calculation and Practical Usage**

a. A load of 10 ohms is connected to a source with 120 volts. What is the current drawn?

From ohm's law,

I = E/R

I = 120/10 = 12 amps

There you go. We hope that we gave you even just a little idea about Ohm's Law.

You may also visit recommended websites if you want to know more about one of the most important law in electricity, Ohm's Law.

Ohm's Law Calculator = http://www.the12volt.com/ohm/page2.asp http://www.allaboutcircuits.com/vol_1/chpt_2/1.html http://www.electronics-tutorials.ws/dccircuits/dcp_2.html