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在初中物理电学习题中,电路图分析占有较大的比重,常常出现一类因开关的闭合或断开、滑动变阻器滑片的移动等引起电路中的电流表、电压表示数发生变化的题目.这些题目中一般是由电流表、电压表、变阻器、电键、电源和几个用电器组成的电路,一是通过电键的打开或闭合,研究电路的组成形式,分析各用电器之间的串、并联关系;二是研究由于变阻器滑片的移
In the junior high school physics electric learning problem, the circuit diagram analysis occupies a large proportion, often appearing in a class of problems caused by changes in the ammeter or voltage representation of the circuit due to the closing or opening of the switch, the movement of the sliding varistor slider, etc. In general, a circuit consisting of an ammeter, a voltmeter, a rheostat, a key, a power supply, and several electrical appliances is used. First, the composition of the circuit is studied through the opening or closing of the electrical key, and the serial and parallel relationships between the electrical appliances are analyzed. The second is to study the movement of the varistor slider