WATTMETERS
Test Instruments & Measuring Devices
Figure 13 Two Wattmeters to Measure 3f Power
Summary
Wattmeters are summarized below.
Wattmeter Summary
Measures real power delivered to the load
Single-phase AC or DC - voltage component (movable coil) connected in parallel
with the load and the current component (fixed coil) connected in series with the
load
Three-phase AC - summation of Phase A and B powers
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