一、知识点拨在电学计算及贵阳市中考中,经常考察动态电路,也就是根据欧姆定律、电功、电功率等公式计算电路时,或者有多个变量和条件不足,无法直接计算时,就需要根据题中已知的等量关系或各状态下不变的量列方程计算。二、电学列方程计算的考法指导1、抓住同一电源电压不变或同一电源在不同的电路状态下电压相等列方程即:I1R1=I2R2或U=U1+U2的形式列方程2、串联电路通过各元件的电流相等列方程 First, knowledge appropriation In the calculation of electricity and Guiyang City in the exam, often studying the dynamic circuit, that is, according to Ohm’s law, electric power, electric power and other formulas to calculate the circuit, or a number of variables and conditions are not enough, you can not directly calculate Calculated according to the known equivalence relations in the title or the invariant quantities and equations in each state. Second, the test method of calculating electrical column calculation 1, to seize the same power supply voltage or the same power supply in different circuit conditions equal voltage column equation that is: I1R1 = I2R2 or U = U1 + U2 column equation 2, the series Circuit through the components of the current equal column equations