# Burden Resistor calculation

From lechacal

## Burden Resistor Formulae

R = (Vcc * Nturns) / (2√2 * Irms)

**R**: Burden resistor value in Ohm

**Vcc**: ADC max voltage range (usually 3.3V)

**Nturns**: Number of CT sensor turns (see specs). SCT-013 is 2000 turns. SCT-019 is 6000.

**Irms**: Max current to be read in rms

## Current Coefficient Formulae

This will compute ICAL.

ICAL = Nturns / R

**ICAL**: Current Coefficient

**Nturns**: Number of CT sensor turns

**R**: Burden resistor value in Ohm