Ohm's Law Calculation with Examples

Hey, in this article we are going to see the proper Ohm's law calculation and execution with examples. Basically, ohm's law states that when the temperature and other physical quantities remain constant the potential difference or voltage across a conductor is directly proportional to the current flowing through it.

That means if the voltage across the conductor is increased the current flowing through the conductor also be increased and if the voltage across the conductor has decreased the current flowing through the conductor will be decreased. Ohm's law will be affected by the temperature.

Ohm's Law Equation

V=IR  here, V= Voltage across the conductor, I = current flowing through the conductor, R = resistance of the conductor.

The equation can be rearranged as,

I=V/R or R = V/I

Remember that the current(I) is measured in amperes(A), Voltage(V) is measured in volts, and the resistance(R) is measured in ohm.

Ohm's Law Calculation

First of all, we will calculate the current flow. For example, we have a power supply of 9V DC and have a load having a resistance of 9 ohms. Now we connect the load to the power source.

According to Ohm's law, the current flow will be I = V/R = 9/9 = 1A

Now, let's find out the resistance of the unknown load. We have a power source of 9V DC. Now the current flowing in the circuit is 3A.

So, according to Ohm's law, the resistance of the load will be, R = V/I = 9/3 = 3A

The voltage drop across a resistor also can be measured by the equation of Ohm's law. For example, 2A current flowing through a 5-ohm resistance so the voltage drop across that resistor will be,

V=I*R = 2*5= 10 V

So, you now understand that Ohm's law calculation is very simple and easy. Ohm's law is very helpful in finding out the resistance in a live circuit. You do not need to turn off the power supply or shut up the circuit. You can easily find out the resistance by measuring the voltage and current. after calculating them.

Ohm's law is also very helpful in finding out the power in a circuit. Electrical power is the rate at which the electrical energy is produced or absorbed by the load.

The power can be found out by this equation, P = VI or P = I^2R

So, if the voltage is 9V and the current flow is 3A then the power will be 9*3 = 27 watts.

If you don't know the voltage then also you can find out the power from the current and resistance value. For example, if the current flow is 2A and the resistance is 5ohm then the power will be = I^2R = 2^2*5 = 20 watts.

If you don't know the current then also you can find out the power from the voltage and resistance value. For example, if the voltage is 3V and the resistance is 9 ohm then the power will be = V^2/R = 3^2/9 = 9/9 = 1A

Read Also: 

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• [Main] Difference Between Voltage and EMF Explained
• Power Factor Formula Explanation
• The main important difference between AC and DC
• Impedance Formula and Theory Explanation

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