From c0168cd33f6670f7e32eaa04d77b6be70b3588d4 Mon Sep 17 00:00:00 2001 From: Gmuslow <54784260+Gmuslow@users.noreply.github.com> Date: Sun, 30 Oct 2022 16:33:13 -0500 Subject: [PATCH] Created equivalent_resistance under Electronics (#6782) * Create resistor_equivalence.py * Update resistor_equivalence.py * Update electronics/resistor_equivalence.py removed an unnecessary space Co-authored-by: Caeden * Update resistor_equivalence.py fixed the snake_case requirement * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Update resistor_equivalence.py finalize the naming convention errors (hopefully) * Update resistor_equivalence.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci Co-authored-by: Caeden Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Christian Clauss --- electronics/resistor_equivalence.py | 58 +++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 electronics/resistor_equivalence.py diff --git a/electronics/resistor_equivalence.py b/electronics/resistor_equivalence.py new file mode 100644 index 000000000..7142f838a --- /dev/null +++ b/electronics/resistor_equivalence.py @@ -0,0 +1,58 @@ +# https://byjus.com/equivalent-resistance-formula/ + +from __future__ import annotations + + +def resistor_parallel(resistors: list[float]) -> float: + """ + Req = 1/ (1/R1 + 1/R2 + ... + 1/Rn) + + >>> resistor_parallel([3.21389, 2, 3]) + 0.8737571620498019 + >>> resistor_parallel([3.21389, 2, -3]) + Traceback (most recent call last): + ... + ValueError: Resistor at index 2 has a negative or zero value! + >>> resistor_parallel([3.21389, 2, 0.000]) + Traceback (most recent call last): + ... + ValueError: Resistor at index 2 has a negative or zero value! + """ + + first_sum = 0.00 + index = 0 + for resistor in resistors: + if resistor <= 0: + raise ValueError(f"Resistor at index {index} has a negative or zero value!") + first_sum += 1 / float(resistor) + index += 1 + return 1 / first_sum + + +def resistor_series(resistors: list[float]) -> float: + """ + Req = R1 + R2 + ... + Rn + + Calculate the equivalent resistance for any number of resistors in parallel. + + >>> resistor_series([3.21389, 2, 3]) + 8.21389 + >>> resistor_series([3.21389, 2, -3]) + Traceback (most recent call last): + ... + ValueError: Resistor at index 2 has a negative value! + """ + sum_r = 0.00 + index = 0 + for resistor in resistors: + sum_r += resistor + if resistor < 0: + raise ValueError(f"Resistor at index {index} has a negative value!") + index += 1 + return sum_r + + +if __name__ == "__main__": + import doctest + + doctest.testmod()