电功率的测量实验,是中考中的考查热点。电功率的测量有两种方法,第一种是伏安法,用电流表测量通过某一用电器的电流I,用电压表测量该用电器两端的电压U,根据P=UI计算出该用电器的定功率;第二种方法是电能表法,关闭所有用电器,闭合某一用电器开关的同时,用秒表记录时间t,并且数出电能表表盘转动的圈数(或者闪烁的次数)n,根据电能表铭牌上每千瓦时转盘转动的圈数(或者闪烁的次数)N,可 Electric power measurement experiment is a hot spot in the exam test. There are two ways to measure the electrical power. The first one is the voltammetric method. The ammeter measures the current I passing through a certain electrical device. The voltmeter measures the voltage U across the electrical device. According to P = UI, The second method is the meter method, turn off all electrical appliances, turn off a certain electrical switch at the same time, use a stopwatch to record the time t, and count out the number of turns (or the number of flashes) electric meter dial rotation n, Based on the number of turns (or number of flashes) per kWh of turntable on the nameplate of the watt-hour meter, N