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PrismKit

Voltage Divider Calculator

Local

Work out a divider's output voltage, current and resistor power, or find R1 for a target voltage with the nearest E12, E24 and E96 values.

Ohm's Law Calculator

Enter any two of voltage, current, resistance and power to get the other two, with SI prefixes like 4.7k and 20m.

LED Resistor Calculator

Find the series resistor for one or more LEDs, rounded up to a standard E-series value, with its power rating and actual current.