Resistors

Resistors (1)

Series   Values add together!  The equivalent value of the resistors is Req = R1 + R2 + R3 ...

Resistors in series increase value:  The equivalent value is always greater than the biggest!


Parallel
(1 ÷ Req) = (1 ÷ R1) + (1 ÷ R2) + (1 ÷ R3) ...

If two in parallel formula can be simplified to Req = (R1 × R2) ÷ (R1 + R2)

Resistors in parallel reduce value:  The equivalent value is always less than the smallest!


For combinations reduce parallel into equivalent value first, then calculate series value to give current/voltage