Ohm’s Law
Ohm’s Law & Power Calculator
Enter any two values to calculate the others.
Understanding Ohm’s Law
Ohm’s Law is the most fundamental principle in electronics. It describes the relationship between Voltage (V), Current (I), and Resistance (R).
The Key Formulas:
Why it matters for engineers: Whether you are calculating the power dissipation of a resistor or determining the current draw of your IoT sensor, Ohm’s Law is your daily tool. For example, if your circuit runs at 5V and has a total resistance of 250Ω, it will draw 0.02A (20mA) of current.