Electronics & Electricity

Ohmsches Gesetz Rechner

Calculate voltage, current, resistance, and power from any two known values using Ohm's law and the power law.

LED-Vorwiderstand Rechner

Work out the series resistor value and power rating an LED needs from the supply voltage, LED colour, and desired current.

Akkulaufzeit-Rechner

Estimate how long a battery or pack will last from its capacity and the device current draw, with common cell presets and an adjustable usable capacity factor.

Electronics & Electricity

Kondensator-Ladezeit Rechner

Calculate the RC time constant, the time to reach 63% and 99% charge, and a full charge progression table for a capacitor charging through a resistor from a DC supply.

Electronics & Electricity

Kabelquerschnitt-Rechner

Work out the minimum cable cross-section needed for a given current, cable run length, and maximum acceptable voltage drop, with copper or aluminium conductors and the nearest standard section and AWG equivalent.

Electronics & Electricity

Sicherungsgrößen-Rechner

Work out the nominal current drawn by a device from its power and supply voltage, then get the recommended fuse or breaker rating with a safety margin for continuous or intermittent loads, for AC mains or 12V/24V DC circuits.