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Page 355

| Figure 17-22 (cont.) (C) External details, and (D) internal details of cumulative demand register (Courtesy, Westinghouse Electric Co.) |

| voltmeter, on the other hand, must be connected across or in parallel with the circuit if it is to measure the voltage of the circuit. Similarly, the current coil in wattmeters, watt-hour meters, reactive volt-ampere-meters, and power factor and other meters must be connected in series with the coil. The voltage coil in these instruments must be connected across or in parallel with the circuit. A schematic diagram showing how some of these meters are connected in a circuit is shown in Fig. 17-25. |

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