# Resistance help

1. Oct 30, 2006

### roxas

what is the smallest resistance that can be obtained by using onlu a 3 ohm resistor and a 12 ohm resistor??

i calculATED USING 1/3 = 1/2 AND I GOT 4 OHMS

thx anyway

2. Oct 30, 2006

### Hootenanny

Staff Emeritus
Okay, if the resistors are placed in series the effective resistance of the system is simply the sum of the individual resistances (i.e. $R_{t}=3+12=15\Omega$).

However, if we place the resitors are placed in parallel the effective resistance of the array is....?