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一、伏安法测电功率用电压表测出小灯泡两端的电压,用电流表测出小灯泡中的电流,则可利用P=UI计算电功率,在额定电压下测出的电功率就是额定功率.这是物理学中常用的一种间接测量方法,又被称为伏安法.例1(2013年乐山)在“测定额定电压为2.5V小灯泡的电功率”的实验中,阳阳同学已连接好如图1所示的部分电路.
First, voltammetry power measurement Voltmeter with a small voltage across the bulb measured with a current meter to measure the current in small bulbs, you can use the P = UI calculate the electrical power, the rated voltage measured electrical power is the rated power. Is an indirect measurement method commonly used in physics, also known as voltammetry. Example 1 (Leshan 2013) In the “determination of the rated voltage of 2.5V small bulb electric power” experiment, Yang Yang students Connect as shown in Figure 1, part of the circuit.