Ohm’s law

Ohm’s Law Calculator

by
Ohm's law calculator feature image with a multimeter, simple circuit, and V equals I times R formula.

Electronics Tools Ohm’s Law Calculator Solve voltage, current, resistance, and power for basic DC circuits. Pick the unknown value, enter the other two values, and the calculator handles the unit conversion. Ohm’s law diagram Voltage, current, and resistance arranged around the Ohm’s law relationship. V I R V = I x R What this tool … Read more

LED Resistor Calculator

by
LED resistor calculator showing a red LED, current limiting resistor, circuit diagram, and resistor value readout.

Electronics Tools LED Resistor Calculator Choose a current limiting resistor for a single LED. Enter the supply voltage, forward voltage, and target LED current to estimate resistance, heat, and a practical standard resistor value. LED with current limiting resistor A simple DC circuit showing a supply, resistor, LED, and ground return. +Vs R LED GND … Read more