Ohm's Law Calculator
Calculate voltage (V), current (A), resistance (Ω), and power (W) using Ohm's Law. Enter any two values to find the others.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power
⚡ Voltage (V)
12
🔌 Current (A)
2
🔧 Resistance (Ω)
6
💡 Power (W)
24
Formulas
Save Configuration Snapshot
Save current parameters to your dashboard for instant one-click reloading.
About This Calculator & Guide
About the Ohm's Law Calculator
The Ohm's Law Calculator is a specialized online utility designed to help you calculate voltage, current, resistance, and power using ohm's law. free online electrical calculator. It performs calculations in real-time to provide immediate, reliable estimates for study, work, or daily tasks.
How to Use
Simply enter your parameters in the input fields of the calculator widget above. The tool evaluates the inputs instantly and displays the results in real-time. You can modify any value to check alternate scenarios and compare figures dynamically.
Data Privacy & Safety
All calculations are executed locally within your web browser. No inputs are sent to our servers or stored externally, ensuring your personal and financial details remain completely private and secure.
FAQ
Frequently Asked Questions
What are the units of measurement in Ohm's Law?+
Voltage is measured in Volts (V), Current is measured in Amperes (A), Resistance is measured in Ohms (Ω), and Power is measured in Watts (W).
How does increasing resistance affect current?+
According to Ohm's Law, current is inversely proportional to resistance. If you increase the resistance in a circuit while keeping the voltage constant, the current flowing through the circuit will decrease.
What is Joule's Law and how does it relate to Ohm's Law?+
Joule's Law states that the power generated in a circuit is the product of voltage and current (P = V * I). Chaining this with Ohm's Law allows you to compute power directly from resistance and current: P = I² * R.
Can Ohm's Law be applied to Alternating Current (AC) circuits?+
Yes, but in AC circuits, simple resistance (R) is replaced by Impedance (Z), which accounts for capacitive and inductive reactances. The equation becomes V = I * Z.