Wrote a python program for the Casio fx-CG50 to do the One Over method for parallel resistors. Basically you'd enter the R1 and R2 values and 0 for R3 to get the simple || result. Or enter up to R5...

If you need more resistors you can iterate on the if statements.

from math import* a = float(input("R1 Value = ")) b = float(input("R2 Value = ")) c = float(input("R3 Value = ")) if c == 0: firstOneOver = (1/a)+(1/b) solution = (1/firstOneOver) print(solution) if c > 0: d = float(input("R4 Value = ")) if d == 0: secondOneOver = (1/a)+(1/b)+(1/c) solution = (1/secondOneOver) print(solution) if d > 0: e = float(input("R5 Value = ")) if e == 0: thirdOneOver = (1/a)+(1/b)+(1/c)+(1/d) solution = (1/thirdOneOver) print(solution) if e > 0: fourthOneOver = (1/a)+(1/b)+(1/c)+(1/d)+(1/e) solution = (1/fourthOneOver) print(solution)