Discussion
A three-element meter on a four-wire system has its elements balanced. If one phase carries 4 kW and the other two carry 2 kW each, the register advances at a rate corresponding to
Answer: D
Each element contributes a torque proportional to the power of its own phase, and since they act on a common spindle the torques add. The disc speed therefore corresponds to the total of eight kilowatts however unequally that total is divided.
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