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判断电路中电表(电流表、电压表)读数的变化,可考查学生对串联、并联电路特点和欧姆定律掌握程度,以及应用这些知识解决实际问题的能力。一些同学由于受到各种因素的制约,在解题时乱加揣测,造成判断失误。其实,在电路中,引起电表读数变化的根源是电路中的滑动变阻器的滑片滑动,或电路中的某个电键的通断变化,即电路中的电阻变化。限于初中学生的水平,一般只涉及简单
Judging the changes in the meter’s ammeter (ampere meter, voltmeter) readings, one can examine the student’s ability to master the characteristics of series and parallel circuits and Ohm’s Law, and the ability to apply this knowledge to solve practical problems. Some classmates are constrained by various factors and make inaccurate observations when solving problems, causing misjudgments. In fact, in the circuit, the root cause of changes in the reading of the meter is the slide of the sliding rheostat in the circuit, or the on and off change of a certain key in the circuit, that is, the resistance change in the circuit. Limited to the level of junior high school students, generally only involves simple