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57 lines
1.5 KiB
Python
57 lines
1.5 KiB
Python
# https://byjus.com/equivalent-resistance-formula/
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from __future__ import annotations
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def resistor_parallel(resistors: list[float]) -> float:
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"""
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Req = 1/ (1/R1 + 1/R2 + ... + 1/Rn)
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>>> resistor_parallel([3.21389, 2, 3])
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0.8737571620498019
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>>> resistor_parallel([3.21389, 2, -3])
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Traceback (most recent call last):
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...
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ValueError: Resistor at index 2 has a negative or zero value!
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>>> resistor_parallel([3.21389, 2, 0.000])
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Traceback (most recent call last):
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...
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ValueError: Resistor at index 2 has a negative or zero value!
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"""
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first_sum = 0.00
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for index, resistor in enumerate(resistors):
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if resistor <= 0:
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msg = f"Resistor at index {index} has a negative or zero value!"
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raise ValueError(msg)
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first_sum += 1 / float(resistor)
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return 1 / first_sum
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def resistor_series(resistors: list[float]) -> float:
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"""
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Req = R1 + R2 + ... + Rn
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Calculate the equivalent resistance for any number of resistors in parallel.
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>>> resistor_series([3.21389, 2, 3])
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8.21389
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>>> resistor_series([3.21389, 2, -3])
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Traceback (most recent call last):
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...
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ValueError: Resistor at index 2 has a negative value!
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"""
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sum_r = 0.00
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for index, resistor in enumerate(resistors):
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sum_r += resistor
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if resistor < 0:
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msg = f"Resistor at index {index} has a negative value!"
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raise ValueError(msg)
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return sum_r
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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