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
Active power of Y phase
Reactive power of R phase

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Measurement and Instrumentation
A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these,

 2 represents greater precision but 1 and 3 represent same precision.
 1 represents greater precision than 2 and 3.
 2 and 3 represent greater precision than 1.
 1, 2 and 3 represent same precision.

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