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当电路中滑动变阻器的滑片移动(或电键断开、闭合)时,怎样判断电路中的电流表、电压表的示数变化情况?这类问题不要求进行复杂的运算,一般按照以下步骤分析:
When the slide of the sliding rheostat in the circuit moves (or the key is opened and closed), how to judge the current change of the ammeter and voltmeter in the circuit? This kind of problem does not require complicated calculations. Generally, the following steps are analyzed: