Case 1: The source is star connected and the load is a balanced star connected impedance of 10 Ohms in each arm

Case 2: The source is star connected and the load is a balanced Delta connected impedance of 10 Ohms in each arm

Case 3: The source is Delta connected and the load is a balanced star connected impedance of 10 Ohms in each arm

Case 4: The source is Delta connected and the load is a balanced Delta connected impedance of 10 Ohms in each arm.