Hello,

In......All About Circuits > Volume I - DC > Chapter 7: SERIES-PARALLEL COMBINATION CIRCUITS > Analysis technique. It states the equivalent resistor values for R1(100ohms) and R2(250ohms) is equivalent to 71.492ohms as a single resistor. I do not understand how this works. Can someone help explain it?

DrWack

 

these 2 resistors are connected in parallel to each other. Therefore the formula (also stated in vol. 1 ch. 5 under parallel circuits.) is ...
RTotal = 1 / (1/R1 + 1/R2 + . . . 1/Rn)
does this make sense?
here it is worked out-
RTotal = 1/ (1/100+1/250)
RTotal = 1/ (0.014)
RTotal = approx. 71Ω
hope this helps

-fire

 

Ohhh...it makes sense now. Thanks a lot man.

DrWack

 

np , feel free to ask more questions....

-fire