Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Active power in R phase
Power proportional to 3 phase power if the load is balanced
Reactive power of R phase
Active power of Y phase

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Measurement and Instrumentation
Assertion(A): A low power factor wattmeter has special constructional features to ensure accurate measurment. Reason(R): Extension of wattmeter range in DC circuit can be easily done by using current and potential transformer

 Both A and R is true and R is correct explanation of A C.
 A is false R is true.
 A is true R is false.
 Both A and R is true and R is not correct explanation of A.

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