Meter in the AC circuit, can be divided into two

Measuring instrument called a power meter. It is mainly used for a certain period of time, the cumulative energy generated by the generator or load consumption of electricity meter. Meter for AC circuits can be divided into two categories: single-phase and  air circuit breaker  watt-hour meter meter. (A) a single-phase watt-hour meter single-phase watt-hour meter is the basic structure of AC electric meter are generally based on  power transformers induction (eddy current) made ​​of the principle, so called induction system meter. Meter models were different, but its  Circuit breaker is similar. Figure 4-5-6 shows the structure diagram, mainly by the electromagnetic elements 2, the turntable 3, the braking permanent magnet 5, the calculation unit 6, the carrier 4 and junction boxes.