HP 35S: Resistors in Series or Parallel (Portred from HP33E)  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: HP 35S: Resistors in Series or Parallel (Portred from HP33E) (/thread252836.html) 
HP 35S: Resistors in Series or Parallel (Portred from HP33E)  Eddie W. Shore  10132013 Resistors in Series or Parallel Source: HP33E Student Engineering Applications, 1978 Original Calculator: HP33S Credit to Hewlett Packard Company Ported to HP 35S by Eddie Shore, 10/10/2013
Instructions: 2. At the Mode Prompt (INPUT M), enter 0 R/S for Parallel Resistors, 1 R/S for Series Resistors 3. Enter resistor values (assumed to be in Ohms) then press R/S. 4. To find the total, press XEQ R016. 5. Optional: Store the result in a variable for future use, as long is it not R. Parallel Resistors: total resistance = 1/( 1/R1 + 1/R2 + ... ) Series Resistors: total resistance = R1 + R2 + ...
R001 LBL R
Re: HP 35S: Resistors in Series or Parallel (Portred from HP33E)  Harald  10132013 I don't quite see the point of the program. I ususally do this: R1 1/x R2 1/x + 1/x or on the WP34S: R1 Enter R2 g 
I am probably missing something...
Re: HP 35S: Resistors in Series or Parallel (Portred from HP33E)  R. Pienne  10142013 It's interesting to see a (ported) program from 1978, thanks to Eddie. In those days programming a calculator was such a novelty that I think HP just wanted to show off the input/looping features at every opportunity. Of course, series resistances can be much more easily calculated by addition, and parallel by a much simpler program: LBL R 1/x x<>y 1/x + 1/x RTN. That was as true in 1978 as it is now.
