# electrical equations

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Revision as of 06:39, 20 January 2014 by Root (Talk | contribs) (Created page with 'Category:Engineering P = E^2 / R = Voltage Divider = == Voltage Divider No Load == Vout = Vin * (R2 / (R2 + R2)) Vin = Vout * ((R1+R2)/R2) <pre> Vout+ O Vout- O …')

P = E^2 / R

## Contents

# Voltage Divider

## Voltage Divider No Load

Vout = Vin * (R2 / (R2 + R2)) Vin = Vout * ((R1+R2)/R2)

Vout+ O Vout- O | | | | R1 | R2 | +--/\/\/--+--/\/\/--+ | | | | Vin+ Vin-

## Voltage Divider Under Load

Rload +--/\/\/--+ | | | | Vout+ O Vout- O | | | | R1 | R2 | +--/\/\/--+--/\/\/--+ | | | | Vin+ Vin-

Vout = Vin (

## Picking a value for R1 and R2

Assume you have a restive sensor to test. Out of circuit you would test the sensor to determine its minimum resistance and maximum resistance. Then pick

R2 = sqrt (Rmin * Rmax)