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在学习高中物理选修3-1《恒定电流》一章时,我们会告诉学生有电流流过电阻电势降低,电势降低的值等于该电阻分得的电压。学生很容易接受这一说法,因为在初中他们已经掌握了一些电路的知识。然而在高中物理选修3-1中,新教材从电场的角度进一步分析电路中的电势降落问题,教材中指出通有恒定电流的导体中存在恒定电场,恒定电场的电场线总与导线平行,沿着电场线电势降低。问题来了:导线中也有恒定电场,为什么没有电势降
When studying High School Physics elective 3-1 “Constant Current” chapter, we will tell the student that a current flow through the resistor decreases in potential equal to the voltage divided by the resistor. Students easily accept this argument, because in junior high school they have mastered some knowledge of the circuit. However, in high school physics elective 3-1, the new textbook further analyzes the problem of potential drop in the circuit from the perspective of the electric field. The textbook states that there is a constant electric field in a conductor with a constant current. The electric field line of the constant electric field is always parallel to the conductor. The electric field line potential decreases. The problem is: there is also a constant electric field in the wire, why there is no potential drop