OHMS LAW CALCULATOR
"Use the Free Ohm’s Law Calculator to quickly compute voltage, current, resistance, or power in electrical circuits. Enter any two values and get the rest instantly — easy, accurate, and no login required."
⚡ Ohm’s Law Calculator — Solve Circuit Values Fast
Welcome to the Free Ohm’s Law Calculator on calculator.cl! This useful tool helps you compute key electrical values — such as voltage (V), current (I), resistance (R), and power (P) — based on Ohm’s Law and related formulas.
Whether you’re designing a circuit, checking values for repair, or studying electronics, this calculator gives accurate results instantly — no signup or login required.
🧠 What Is Ohm’s Law?
Ohm’s Law is a fundamental rule in electronics that relates voltage, current, and resistance in a simple formula:
V=I×RV = I × RV=I×R
Where:
V is voltage (volts, V)
I is current (amperes, A)
R is resistance (ohms, Ω)
This law helps you understand how electrical circuits behave and calculate unknown values when designing or analyzing circuits.
🔌 How the Calculator Works
To use this tool:
Select the quantity you want to calculate (Voltage, Current, Resistance, or Power).
Enter the known values for the other two variables.
Click Calculate.
The calculator uses Ohm’s Law and related formulas (including power calculations) to compute the unknown value and display the result instantly.
For power (P), the formula used is:
P=V×IP = V × IP=V×I
This lets you find power when you know voltage and current.
📊 Common Use Cases
This Ohm’s Law Calculator is helpful for:
Students learning basic electricity concepts
Hobbyists and makers designing circuits
Technicians diagnosing electrical issues
Engineers verifying calculations
It simplifies circuit math so you can focus on design and analysis.
📍 Examples
If you know voltage (12 V) and resistance (6 Ω):
- I=VR=126=2AI = \frac{V}{R} = \frac{12}{6} = 2 AI=RV=612=2A
If you know current (3 A) and resistance (4 Ω):
- V=I×R=3×4=12VV = I × R = 3 × 4 = 12 V V=I×R=3×4=12V
To find power with 12 V and 2 A:
- P=V×I=12×2=24WP = V × I = 12 × 2 = 24 WP=V×I=12×2=24W
These calculations help you understand how circuits operate.
💡 Tips for Best Results
Always use consistent units (V for volts, A for amperes, Ω for ohms).
Double-check known values before calculating.
Use this tool to cross-verify manual calculations.
⚠️ Important Notes
This calculator assumes ideal conditions — real circuits may have additional factors like temperature effects or complex impedances.
Always follow safety procedures when working with live circuits.
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