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42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
# https://en.wikipedia.org/wiki/Wheatstone_bridge
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from __future__ import annotations
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def wheatstone_solver(
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resistance_1: float, resistance_2: float, resistance_3: float
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) -> float:
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"""
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This function can calculate the unknown resistance in an wheatstone network,
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given that the three other resistances in the network are known.
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The formula to calculate the same is:
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---------------
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|Rx=(R2/R1)*R3|
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---------------
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Usage examples:
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>>> wheatstone_solver(resistance_1=2, resistance_2=4, resistance_3=5)
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10.0
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>>> wheatstone_solver(resistance_1=356, resistance_2=234, resistance_3=976)
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641.5280898876405
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>>> wheatstone_solver(resistance_1=2, resistance_2=-1, resistance_3=2)
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Traceback (most recent call last):
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...
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ValueError: All resistance values must be positive
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>>> wheatstone_solver(resistance_1=0, resistance_2=0, resistance_3=2)
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Traceback (most recent call last):
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...
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ValueError: All resistance values must be positive
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"""
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if resistance_1 <= 0 or resistance_2 <= 0 or resistance_3 <= 0:
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raise ValueError("All resistance values must be positive")
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else:
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return float((resistance_2 / resistance_1) * resistance_3)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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