Mon May 21, 2012 By: Tabish

equivalent resistance

Expert Reply
Tue May 22, 2012
When two resistors are in series, you add the elements together. When two elements are in parallel you multiply them and divide that by the sum. ie: parallel elements 7 ohms and 8 ohms (8*7)/(8+7). 

If there are more than 2 in parallel however, just fill in this: 

1/Req=1/R1 + 1/R2 + 1/RN

Req is the final answer of the equivalent resistance. 
Rn means you keep adding the reciprocal of the other resistors in parallel.
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