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69 lines (52 loc) · 1.94 KB
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# https://en.wikipedia.org/wiki/Electrical_reactance#Inductive_reactance
from __future__ import annotations
from math import pi
def ind_reactance(
inductance: float, frequency: float, reactance: float
) -> dict[str, float]:
"""
Calculate inductive reactance, frequency or inductance from two given electrical
properties then return name/value pair of the zero value in a Python dict.
Parameters
----------
inductance : float with units in Henries
frequency : float with units in Hertz
reactance : float with units in Ohms
>>> ind_reactance(-35e-6, 1e3, 0)
Traceback (most recent call last):
...
ValueError: Inductance cannot be negative
>>> ind_reactance(35e-6, -1e3, 0)
Traceback (most recent call last):
...
ValueError: Frequency cannot be negative
>>> ind_reactance(35e-6, 0, -1)
Traceback (most recent call last):
...
ValueError: Inductive reactance cannot be negative
>>> ind_reactance(0, 10e3, 50)
{'inductance': 0.0007957747154594767}
>>> ind_reactance(35e-3, 0, 50)
{'frequency': 227.36420441699332}
>>> ind_reactance(35e-6, 1e3, 0)
{'reactance': 0.2199114857512855}
"""
if (inductance, frequency, reactance).count(0) != 1:
raise ValueError("One and only one argument must be 0")
if inductance < 0:
raise ValueError("Inductance cannot be negative")
if frequency < 0:
raise ValueError("Frequency cannot be negative")
if reactance < 0:
raise ValueError("Inductive reactance cannot be negative")
if inductance == 0:
return {"inductance": reactance / (2 * pi * frequency)}
elif frequency == 0:
return {"frequency": reactance / (2 * pi * inductance)}
elif reactance == 0:
return {"reactance": 2 * pi * frequency * inductance}
else:
raise ValueError("Exactly one argument must be 0")
if __name__ == "__main__":
import doctest
doctest.testmod()