Complete Ohm’s Law Explanation Guide With Example

When an electrical student starts his or her study or he/she selects the electrical technology that he/she will make his or her future in electrical technology. In the first book, he/she faces a law which is called ohm’s law which very important law. Because using this law an electrical student can do the calculation of many electrical circuit examples, but many people learn ohm’s law just for solving examples given in books or paper but can not use it in real work.
Everyone knows that the ohm law is important for electrical student and everyone know that ohm’s law is too simple to learn but many students can not use it really work, which means that they did not understand completely the ohm law. Today in this article we will disuse ohm‘s law and its formulas with complete examples which will make you completely understand.

ohm law

Ohm’s Law Explanation

In the electric circuit, the current (I) is directly proportional to the appalled voltage and inversely proportional to the total circuit resistances. This law is called ohm’s law which was made/explained by Bavarian mathematician and physicist Dr Georg Ohm.

In simple words, if the circuit current will high then the circuit voltage is also high or we can say that current and voltage will have a relationship with one another and if resistance will high then the current and voltage will be getting low.

Formulas of Ohm’s Law

Current = potential difference/resistances  OR  I = V/R  OR Effect = Cause/Opposition
The above formulas  – are called ohm law formulas. We can apply these formulas to complete a circuit or a part of the circuit. If we want to apply these formulas to complete the circuit then the procedure is to divide the complete circuit current, and complete circuit voltage to complete circuit resistances.
If you want to apply formulas on a part of a circuit to find out the current then the procedure is to divide part of the voltage into the part of the resistance.

For calculations, we can use ohm’s law in three shapes which are

I=V/R (Current = voltage divided by resistance)
V=IR (Voltage = current multiplied by resistance)
R=V/I (Resistance = voltage divided by current)

Ohm’s law Example Explanation

1. We have a circuit, in which the resistance is 5 ohm and the applied voltage is 10 volts then how can we find out the current (I)?
It’s simple using the first formula I=V/R
In the circuit V is 10 and R is 5, then 10/5 = 2

So the total current of this circuit is 2A (2 Ampere).

2.       In the above circuit we know that the current is 2 and the resistance is 5 and want to find of circuit voltage then.
V= IR  which is V=IxR Or  V= 2 x 5= 10V
Then the voltage of the circuit is 10 volts.
3.       And if we have volts and current values and want to find out the total resistance then
Volts is 10 and current is 2 Which means that
R=V/I Or R=10/2 = 5-
So the total resistance of the circuit is 5 ohms.
You note that each example finds out the correct value which means the calculations are right. Note that this law can only apply to DC (Direct Current).



I hope now you completely understood ohm’s law and know you can use this law in practical works and circuits. If you got something helpful then kindly share this with your friends. Also, do comments about ohm law examples in the below comments section.

4 thoughts on “Complete Ohm’s Law Explanation Guide With Example

  • September 23, 2021 at 2:49 am

    Do you have a youtube channel if there's one please i need the name of ure YouTube channel.

  • February 9, 2022 at 4:50 pm

    This comment has been removed by the author.

  • February 9, 2022 at 4:55 pm

    This ohms law image is completely known. I like this image. This image enough to understand these law. I have found this image another website:

    Voltage Lab

    Can you write an article about the difference between emf and voltage?


Leave a Reply

Your email address will not be published. Required fields are marked *