Z1 and Z2 are connected in series to form a load. A wattmeter’s current coil is connected in series with the load, whereas its pressure coil is connected across Z2. The wattmeter reads

• A. Power consumed by Z1 and Z2
• B. Power consumed by Z1
• C. Power consumed by Z2
• D. Zero always

Answer: (C)

As you can see from the below figure in load Z1 is connected with the only current coil. In Load Z2 both current from the current coil (CC) and voltage from voltage coil (PC) are present (Power = V × I). Hence the  Wattmeter will read power consumed by Z2.