What is Ohm’s Law?

Physics is all about electronics, circuits and how it works. Ohm's law is a rule highly used in physics and electronics. It states that current through a conductor between two points is directly proportional to current. This law makes it easy to understand how voltage, current, and resistance are all linked in a circuit. Usually, it can be expressed in the form of equation, as shown below; V = I × R

• V is voltage in volts.
• I is current in amperes.
• R is resistance in ohms.

If you know any two values, you can easily find the third one by using this Ohm’s Law calculator—quickly and easily.

How to Use the Ohm's Law Calculator?

This free Ohm’s Law calculator is very easy to navigate and calculate values that you want to find. We break the process into simpler steps to understand how to use this calculator.

Step 1: Choose any two values you already know.

When you're supposed to apply Ohm's Law, you're given two values, and by using the given values, you need to find the third one. You can select the value that you want to find, from the dropdown button:

• Voltage (V).
• Current (I).
• Resistance (R).

Just make sure to leave one of them empty.

Step 2: Enter the numbers in the input boxes.

• For voltage, enter the value in volts (V)
• For Current, use the value in amperes (A)
• For resistance, type value in ohms (Ω)

Step 3: Press the “Calculate” button.

After entering two values, click the calculate button at the bottom. The calculator will use Ohm's Law to find the missing value quickly. You will get your answer right below the button in the correct unit.

How It Works – Simple Formulas

This calculator is developed based on real Ohm's Law formulas, so you can get your answers quickly without worrying about any ambiguity. It uses the following equations, along with the two given values, to find the missing one;

To find Voltage (V):

To find the voltage in a circuit with 0.5 amps of current and 4 ohms of resistance, do the following:

• Current I = 0.5
• Resistance R = 4 Ω
• Put 0.5 in the current bar and 4 in the resistance bar, and click on calculate, and the result will appear in seconds.

• Step 1: Ohm's Law: V = I × R
• Step 2: Given: I = 0.5 A, R = 4 Ω
• Step 3: V = 0.5 × 4 = 2 V

Result: Voltage = 2 V

To find Current (I):

To find the current in a circuit with 2V and 4 ohms of resistance, do the following:

• Put 2V value in the Voltage bar and 4 ohms resistance value in the resistance bar, then click on calculate, and the result will appear in seconds.

• Step 1: Ohm's Law: I = V / R
• Step 2: Given: V = 2 V, R = 4 Ω
• Step 3: I = 2 / 4 = 0.5 A

Result: Current = 0.5 A

To find Resistance (R):

To find the resistance in a circuit with 0.5 amps of current and 2V Voltage, do the following:

• Step 1: Ohm's Law: R = V / I
• Step 2: Given: V = 2 V, I = 0.5 A
• Step 3: R = 2 / 0.5 = 4 Ω

Result: Resistance = 4 Ω

To find Power (P):

To find the power in a circuit with 0.5 amps of current with 2V voltage, do the following:

• Step 1: Power formula: P = V × I
• Step 2: Given: V = 2 V, I = 0.5 A
• Step 3: P = 2 × 0.5 = 1 W

Result: Power = 1 W

There is real science behind these formulas. They are used every day by engineers, electricians, and students to understand how electricity flows. The calculator makes these equations easy to use. No math skills needed!

Why Should You Use Ohm’s Law Calculator?

MathCalc is all about making calculations easy, quick, and fun for everyone. We develop our calculator as the best tool for students, teachers, engineers, and hobbyists. Here are some of the reasons why you should use our Ohm’s Law Calculator:

Easy for Everyone

You don't need to know any formulas or be an expert. Just type two values and get your answer.

Instant Results

We understand the stress of you and offer you fast, accurate answers without doing any math.

Great for Learning

This tool is perfect for school projects, science class, engineering homework, electronics practice

Works on All Devices

It can be used on a computer, tablet, or smartphone. It's entirely online. No apps or downloads required.

Free and Safe

The calculator is free to use without requiring any sign-ups, and no tracking.

FAQs

Can I use this calculator on any device?

Yes, it can be used on a computer, tablet, or smartphone. It's entirely online. No apps or downloads required.

Do I need to sign up to use this calculator?

No, this calculator is free to use without requiring any sign-ups, and no tracking is done.

Can I calculate resistance using this calculator?

Yes, you can calculate anything linked to Ohm's law using this calculator.

Bonus Tip

To have quick and accurate results make sure to use consistent units and enter your input values in standard units.

Calculate Your Values Quick And Easy With Ohm’s Law Calculator At MathCalc! Learn More!