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electronics/resistor_equivalence.py
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# 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 for index, resistor in enumerate(resistors): if resistor <= 0: msg = f"Resistor at index {index} has a negative or zero value!" raise ValueError(msg) first_sum += 1 / float(resistor) 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 for index, resistor in enumerate(resistors): sum_r += resistor if resistor < 0: msg = f"Resistor at index {index} has a negative value!" raise ValueError(msg) return sum_r if __name__ == "__main__": import doctest doctest.testmod()