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要想测量小灯泡的电功率,我们当然要从电功率的计算公式入手:根据P=UI可知,我们必须测出小灯泡两端的电压U和通过小灯泡的电流I,才能计算出小灯泡的电功率。而测量小灯泡两端的电压U和通过小灯泡的电流I,需要电压表和电流表。应用电压表和电流表测量小灯泡的功率实验,和测量小灯泡的电阻实验是相似的,都是伏安法的一个具体应用。如果实验中我们的电压表或者电流表损坏了,我们又该如何选择需要的器材测量小灯泡的电功率呢?
To measure the electric power of a small light bulb, of course, we start from the calculation formula of electric power: According to the P = UI, we must measure the voltage U across the small bulb and the current I through the small bulb to calculate the electric power of the small bulb. Measuring the voltage across the small bulb U and through the small bulb current I requires a voltmeter and ammeter. The use of voltmeter and ammeter to measure the power of small light bulb experiment, and the measurement of light bulb resistance experiments are similar, are a specific application of voltammetry. If the experiment of our voltmeter or ammeter damaged, how should we choose the equipment needed to measure the electrical power of small bulbs do?