diff --git a/electronics/real_and_reactive_power.py b/electronics/real_and_reactive_power.py
new file mode 100644
index 000000000000..81dcba800e82
--- /dev/null
+++ b/electronics/real_and_reactive_power.py
@@ -0,0 +1,49 @@
+import math
+
+
+def real_power(apparent_power: float, power_factor: float) -> float:
+    """
+    Calculate real power from apparent power and power factor.
+
+    Examples:
+    >>> real_power(100, 0.9)
+    90.0
+    >>> real_power(0, 0.8)
+    0.0
+    >>> real_power(100, -0.9)
+    -90.0
+    """
+    if (
+        not isinstance(power_factor, (int, float))
+        or power_factor < -1
+        or power_factor > 1
+    ):
+        raise ValueError("power_factor must be a valid float value between -1 and 1.")
+    return apparent_power * power_factor
+
+
+def reactive_power(apparent_power: float, power_factor: float) -> float:
+    """
+    Calculate reactive power from apparent power and power factor.
+
+    Examples:
+    >>> reactive_power(100, 0.9)
+    43.58898943540673
+    >>> reactive_power(0, 0.8)
+    0.0
+    >>> reactive_power(100, -0.9)
+    43.58898943540673
+    """
+    if (
+        not isinstance(power_factor, (int, float))
+        or power_factor < -1
+        or power_factor > 1
+    ):
+        raise ValueError("power_factor must be a valid float value between -1 and 1.")
+    return apparent_power * math.sqrt(1 - power_factor**2)
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()