Ohm's Law & Resistors

Identify resistance values for 4, 5, and 6-band resistors. Includes an interactive visual calculator, color code chart, formulas, and tolerance range details.

Use our free LED resistor calculator to find the perfect resistor for your LED circuit. Get accurate values for single LEDs, multiple LEDs, and different power sources.

Easily calculate output voltage, resistance, or current for loaded and unloaded voltage dividers. Includes formulas, circuit diagrams, and common applications.

Easily calculate voltage, current, resistance, and power with our Ohm’s Law calculator. Features a 12-formula power wheel and interactive VI relationship charts.

Calculate total equivalent resistance for series and parallel circuits. Features interactive diagrams, step-by-step formulas, and worked electronics examples.

Calculate how current splits between parallel resistors with our Current Divider Calculator. Get instant results, circuit diagrams, and real-time charts.

Calculate wire resistance based on material, length, diameter, and temperature. Includes an AWG chart, resistivity data, and interactive physics visualizations.

Instantly calculate the unknown resistance in a balanced Wheatstone bridge. Input three known values to find the fourth. The circuit diagram updates in real-time to reflect the bridge’s state.