diff --git a/electronics/calculate_resistence_in_series.py b/electronics/calculate_resistence_in_series.py
new file mode 100644
index 000000000000..ae03f8d86121
--- /dev/null
+++ b/electronics/calculate_resistence_in_series.py
@@ -0,0 +1,20 @@
+resistors_in_series = [100, 150, 330]
+
+
+def calculate_resistence_in_series(resistors_in_series: list) -> float:
+    """
+    Calculate total resistance of resistors used in series
+
+    >>> calculate_resistence_in_series(resistors_in_series)
+    580
+    """
+    total = 0
+    for val in resistors_in_series:
+        total = total + val
+    return total
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()