Assertion ( A ): A 3 phase wattmeter consists of two wattmeters mounted in one case.
Reason ( R ): Power measurement in a 3 phase circuit can be conveniently done by two wattmeter method.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true
Share your understanding of this question with the correct explanation.