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47 lines
1.5 KiB
Python
47 lines
1.5 KiB
Python
"""Electrical impedance is the measure of the opposition that a
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circuit presents to a current when a voltage is applied.
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Impedance extends the concept of resistance to alternating current (AC) circuits.
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Source: https://en.wikipedia.org/wiki/Electrical_impedance
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"""
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from __future__ import annotations
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from math import pow, sqrt # noqa: A004
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def electrical_impedance(
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resistance: float, reactance: float, impedance: float
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) -> dict[str, float]:
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"""
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Apply Electrical Impedance formula, on any two given electrical values,
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which can be resistance, reactance, and impedance, and then in a Python dict
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return name/value pair of the zero value.
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>>> electrical_impedance(3,4,0)
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{'impedance': 5.0}
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>>> electrical_impedance(0,4,5)
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{'resistance': 3.0}
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>>> electrical_impedance(3,0,5)
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{'reactance': 4.0}
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>>> electrical_impedance(3,4,5)
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Traceback (most recent call last):
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...
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ValueError: One and only one argument must be 0
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"""
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if (resistance, reactance, impedance).count(0) != 1:
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raise ValueError("One and only one argument must be 0")
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if resistance == 0:
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return {"resistance": sqrt(pow(impedance, 2) - pow(reactance, 2))}
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elif reactance == 0:
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return {"reactance": sqrt(pow(impedance, 2) - pow(resistance, 2))}
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elif impedance == 0:
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return {"impedance": sqrt(pow(resistance, 2) + pow(reactance, 2))}
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else:
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raise ValueError("Exactly one argument must be 0")
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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