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Ohm Meter Summary
Three-Phase Wattmeter

Electrical Science Volume 4 of 4
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WATTMETERS Test Instruments & Measuring Devices WATTMETERS Wattmeters are used to determine DC power or real AC power delivered to the load. EO 1.2 STATE the electrical parameters measured by each of the following in-place measuring devices: d. Wattmeter EO 1.3 EXPLAIN  how  the  following  electrical  test  equipment and measuring devices are connected to a circuit: d. Wattmeter Wattmeter The   wattmeter   is   an   instrument Figure 11    Wattmeter Schematic which measures DC power or true AC  power.    The  wattmeter  uses fixed   coils   to   indicate   current, while  the  movable  coil  indicates voltage (Figure 11).   Coils LI1 and LI2  are  the  fixed  coils  in  series with  one  another  and  serve  as  an ammeter.   The two I terminals are connected  in  series  with  the  load. The   movable   coil   Lv,   and   its multiplier resistor Rs, are used as a voltmeter,   with   the   V   terminals connected in parallel with the load. The meter deflection is proportional  to  the  VI,  which  is power. Wattmeters  are  rated  in  terms  of their maximum current, voltage, and power.   All of these ratings must be observed to prevent damage to the meter. Equation (14-15) is the mathematical representation of calculating power in a DC circuit. (14-15) P VI  or  P I2R ES-14 Page 20 Rev. 0







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