Calculadora da Lei de Ohm

⚡ Ohm's Law Calculator – Instantly Calculate Voltage, Current & Resistance

Whether you're a student, electrician, hobbyist, or engineer, understanding Ohm's Law is essential for working with electrical circuits. It's one of the most fundamental principles in electronics, allowing you to easily calculate voltage, current, or resistance when two of the three values are known.

Our Ohm's Law Calculator makes this process effortless. Instead of doing manual math, you can enter any two values and get instant, accurate results.

🧠 What Is Ohm's Law?

Ohm's Law is a simple equation that shows the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit:

Where:

• 𝑉 = Voltage (in volts, V)
• 𝐼 = Current (in amperes, A)
• 𝑅 = Resistance (in ohms, Ω)

Using this formula, you can rearrange it to solve for any unknown value:

To find Current:

To find Resistance:

This simple law forms the foundation of all electrical calculations.

⚡ Why Ohm's Law Is Important

Ohm's Law is used in almost every electrical application:

• ⚙️ Designing circuits and selecting correct components
• 🧰 Troubleshooting faulty wiring or devices
• 💡 Calculating safe current levels to prevent overheating
• 🔌 Understanding energy usage in appliances
• 🧠 Teaching & learning electronics in schools and universities

Whether you're connecting a simple LED or wiring a large electrical system, Ohm's Law helps ensure everything works safely and efficiently.

🧮 Ohm's Law Calculator – How It Works

Our online Ohm's Law Calculator is designed to be simple and intuitive. You just need to enter any two known values, and the calculator will find the third automatically.

🪄 Step-by-Step Guide

Step 1: Choose any two known values:

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

Step 2: Enter the values into their respective input fields.

Step 3: Click the "Calculate" button.

Step 4: The calculator will instantly display the missing value with correct units.

📌 Practical Examples

✅ Example 1 – Finding Current

✅ Example 2 – Finding Voltage

✅ Example 3 – Finding Resistance

📝 Benefits of Using an Online Ohm's Law Calculator

Manually applying formulas can be time-consuming, especially in complex circuits. With our calculator, you can:

📈 Real-Life Applications of Ohm's Law

• 💡 LED Circuits: Determine the correct resistor to avoid burning the LED.
• 🔌 Home Wiring: Calculate safe current flow through outlets and wires.
• 🔋 Battery Systems: Match load resistance with battery voltage. Try our Battery Voltage Calculator
• 🏭 Industrial Control Panels: Balance current, voltage, and resistance for machinery.
• 🧰 Testing Equipment: Verify measurements using multimeters and calculations.

🔗 Related Electrical Calculators

For more advanced electrical calculations, explore our comprehensive collection of tools:

Each of these calculators builds upon the fundamental principles of Ohm's Law to solve specific electrical engineering problems.

❓ Frequently Asked Questions (FAQ)

📝 1. What are the three basic components of Ohm's Law?

Voltage (V), Current (I), and Resistance (R). Knowing any two lets you calculate the third using Ohm's Law.

⚡ 2. Who discovered Ohm's Law?

Ohm's Law was discovered by Georg Simon Ohm, a German physicist, in 1827.

🧮 3. Can I use this calculator for AC circuits?

Yes, but for AC circuits with complex loads, you may also need to consider impedance and power factor, especially in non-resistive circuits.

🧠 4. Is Ohm's Law valid for all materials?

No. Ohm's Law applies to ohmic materials, which have a constant resistance. Some devices (like diodes or transistors) are non-ohmic, meaning their resistance changes with voltage or current.

📲 5. Do I need to install any software to use this calculator?

No. The calculator works directly online in your browser — no downloads or installations required.

🏁 Conclusion

Ohm's Law is one of the most important and useful formulas in electrical engineering and everyday electronics. By understanding the simple relationship between voltage, current, and resistance, you can design, analyze, and troubleshoot circuits with confidence.

With our Ohm's Law Calculator, you can calculate any value in seconds — perfect for students, DIYers, and professionals alike.

👉 Try it now and make electrical calculations fast, simple, and accurate!