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一、电功率的概念两体重不同的同学一起从一楼走上三楼,时间相同,但克服重力做功不同,用功率可以描述他们做功的快慢,计算公式是P=W/t.夏天坐在室内看电视,看到电能表转盘转动,这是电流通过用电器做功,用电器消耗了电能.如果感觉天热,再打开空调,可看到电能表转盘转得飞快,说明电流做功加快.为了比较电流做功的快慢,物理学中引入了电功率这一概念.电功率越大的用电器电流做功越快.由上述概念可知电功率的定义式为P=W/t,由W=UIt得出电功率的决定式为P=UI(两公式普遍适用).如果是纯电阻电路,还可由欧姆定律得出电功
First, the concept of electric power Two students with different weights and walked together from the first floor on the third floor of the same floor, the same time, but to overcome the power of different work, the power can describe the speed of their work, the formula is P = W / t. Watch TV, see the electric meter turntable rotation, this is the current through the electrical work done, the electrical consumption of electrical energy .If you feel hot, then turn on the air conditioner, you can see the meter rotating fast, indicating that the current work faster .In order to compare The speed of doing current work, physics introduced the concept of electric power. The greater the electric power electric current faster work. From the above concept we can see the definition of electric power is P = W / t, from W = UIt determine the electric power P = UI (two formulas are generally applicable.) If it is a pure resistance circuit, Ohm’s law can also be drawn from the power