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Circuit Theory Cheat Sheet (DRAFT) by

Circuit Theory cheat sheet

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Resistors

Series
Rtot = R1 + R2 + ... + Rn
Parallel
Rtot = 1/(1/R1 + 1/R2 + ... + 1/Rn)
 
 

Y-Delta Transf­­or­m­ation

Ra = (R1 * R2) / (R1 +R2 + R3)
Rb = (R2 * R3) / (R1+ R2 + R3)
Rc = (R1 * R3) / (R1+ R2 + R3)
R1 = (RaRb + RaRc + RbRc) / Rb
R2 = (RaRb + RaRc + RbRc) / Rc
R3 = (RaRb + RaRc + RbRc) / Ra

Picture
 
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