(12C) Resistors in Parallel

[Thomas Klemm]

Or then we can use the method described by Sam Levy in his article EE calculations, some not obvious:

Quote:Resistive Dividers
When calculating from known resistors, enter the lower resistor repeatedly.

• Key in the top resistor, and add, the result is the total resistance,
• then divide, the result is the fractional output voltage of the divider.
• Then multiply and subtract to see the output resistance from the divider tap.
  

This leaves us with a program that consists of just the 4 arithmetic operators:

Code:

+
÷
×
-

Example:

50 ENTER ENTER ENTER
65 R/S
28.2609

Kind regards
Thomas

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This method uses:

\(R_1 - \frac{R_1^2}{R_1 + R_2} = \frac{R_1 R_2}{R_1 + R_2}\)