The resistance of the pressure coil and the current coil of a wattmeter are 8000 Ω and 0.3 Ω, respectively. It is connected to measure the power in a single-phase circuit with a load taking a current of 40 A at a power factor of 0.8, with a voltage of 200 V. It is connected in such a way that the pressure coil is on the load side. What will be the percentage error in the wattmeter reading?

• A. 0.78%
• B. 7.8%
• C. 0.078%
• D. 0.0078%