# Analysis serial-parallel circuit help

Discussion in 'General Electronics Chat' started by DrWack, Mar 20, 2005.

1. ### DrWack Thread Starter New Member

Mar 20, 2005
2
0
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

2. ### Firestorm Senior Member

Jan 24, 2005
353
0
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

3. ### DrWack Thread Starter New Member

Mar 20, 2005
2
0
Ohhh...it makes sense now. Thanks a lot man.

DrWack

4. ### Firestorm Senior Member

Jan 24, 2005
353
0
np , feel free to ask more questions....

-fire