Simple and Fast Ohm's Law Calculator for Circuits

An Ohm's Law Calculator is an online tool for quickly solving electric circuit calculating parameters. Based on Ohm’s Law, 𝑉 = 𝐼 × 𝑅, the calculator computes voltage (V), current (I), resistance (R), or Real power (P) when any two values are provided. It simplifies complex value calculations in electronics, making it ideal for engineers, electricians, and students.

Ohms Law Calculator

Ohm's Law in Circuit

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Fig-1: Ohm's Law in Voltage Circuit

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Calculating electrical Voltage using ohm's low.

Formula to find Voltage

1. When the values for Current and resistance are given

V = I × R

2. When the values for Power and current are given

V = PI

3. When the values for Power and resistance are given

V = p × R

Calculating electrical Current using ohm's low.

Formula to find Current

1. When the values for Voltage and resistance are given

I = VR

2. When the values for Power and voltage are given

I = PV

3. When the values for Power and resistance are given

I = ( PR )

Calculating electrical Resistance using ohm's low.

Formula to find Resistance

1. When the values for Voltage and Current are given

R = VI

2. When the values for Power and voltage are given

R = V2P

3. When the values for Power and Current are given

R = PI2

Calculating electrical Power using ohm's low.

Formula to find Power

1. When the values for current and resistance are given

P = R × I2

2. When the values for voltage and resistance are given

P = V2R

3. When the values for voltage and current are given

P = V × I

ohm's law solved problems:

For Example-01, A circuit has a resistance (R) of 20 ohms, and the current (I) flowing through it is 2 amperes. What is the voltage (V) across the circuit?

V = I × R

V = 2 × 20

V = 40v

the voltage across the circuit is 40v.

ohm's law solved problems (Power Calculation):

For Example-02, If the voltage (V) is 40 volts and the current (I) is 2 amperes, calculate the power (P).

P = V × I

P = 40 × 2

P = 80w

the Power across the circuit is 80w.

Application of Ohm’s Law

Light Bulbs: Ohm’s Law is used by engineers to design light bulbs that are not too bright, and not too hot.
Charging Devices: Phone chargers apply Ohm’s law just to ensure that your phone receives the correct voltage or amount of electricity; it is not supplied with excess voltage or too little.
Electric Heaters: Due to resistance control, heaters employ Ohm’s law for warming up rooms in a safer way, compared to other devices.
Audio Equipment: Thanks to Ohm’s Law the speakers and headphones are created to get the proper amount of power needed to sound perfect.
Cars and Planes: Automobile electrical systems use circuits regulated by Ohm’s Law so that there is appropriate voltage provided to all the operating electricity demanding auto parts such as lights and screens.

Frequently Asked Questions - Ohms Law Calculator

What is Ohm's Law?

t is a rule that makes understanding the relationship between voltage and current and resistance, in a circuit.

Why is it called Ohm's Law?

This relationship is named after Georg Simon Ohm, who discovered this relationship in 1827.

How does Ohm’s law come into actual life?

we use it in electronics like phones, computers and even cars so they all receive the right amount of power.

If resistance is high what happens?

Slow current is produced due to the high resistance that the current uses so much electricity couldn’t pass through the circuit.

Can there exist a number such that you could change the resistance in a circuit?

Yes, resistors are used in circuits to signal control or via meters on them the change of the amount of resistance between their pins.

About the Author

Md Jony Islam: Multidisciplinary Engineer & Financial Expert:

Md. Jony Islam is a highly skilled professional with expertise in electronics, electrical, mechanical, and civil engineering, as well as finance. Specializing in transformer service and maintenance for 33/11kV substations, he ensures reliable and efficient electrical systems. His mechanical engineering skills drive innovative designs, while his financial acumen supports effective project budgeting. With a strong foundation in civil engineering, he contributes to robust infrastructure development. Md. Jony Islam's multidisciplinary approach ensures efficiency, quality, and reliability across all projects.

Ohm's Law Calculator - Voltage, Current, Resistance & Power Calculations

Simple and Fast Ohm's Law Calculator for Circuits