电度表又叫千瓦小时计,是计量耗电量的仪表,具有累计功能。目前,大多数家用电度表为 DD28、DD862两种型号。一、电度表的容量1.计算电能的公式P_(max)=UI_(max) cos(?)式中:U——电路电压,220V;I_(max)——额定最大电流(A);cos(?)——负载功率因数。当 cos(?)=1时,P_(max)=UI_(max)(1)由式(1)可知,只要把电路的所有负载功率换算成 Watthour meter, also called kilowatt-hour meter, is a meter for measuring power consumption and has a cumulative function. At present, most household electric meters are DD28 and DD862. First, the power meter capacity 1. Calculate the power formula P_ (max) = UI_ (max) cos (?) Type: U - circuit voltage, 220V; I_ (max) - rated maximum current (A); Cos(?) - load power factor. When cos(?)=1, P_(max)=UI_(max)(1) is known from equation (1), as long as all the power of the circuit is converted into