Parallel Resistors

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Parallel R Demo

series 2 pure


This program calculates the resistance of three resistors in parallel.  The algebraic formula for this calculation is : 1/Rt = 1/R1 + 1/R2 + 1/R3.  If you want to use this program to calculate resistance of two resistors in parallel.  Simply set R3 to an extremely large number.  

var Rt // declares variable total resistance 
var R1 = 1.0 
var R2 = 1.0 
var R3 = 1.0 
var recipRt //declares variable reciprocal of Rt
var Alpha 
var text1= prompt ("Enter decimal number for var R1 ","") 
var text2= prompt ("Enter decimal number for var R2 ","") 
var text3 = prompt ("Enter decimal number for var R3 ","") 
R1 = parseFloat(text1)
R2 = parseFloat(text2)
R3 = parseFloat(text3)
recipRt = 1/R1 + 1/R2 + 1/R3;
Rt = 1/recipRt; Alpha = ("Rtotal is "+Rt);


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Last modified: Monday January 18, 2016.