电学热点问题探讨

• 作 者: 黄华
• 出 处: 新高考(升学考试)
• 发表日期: 2015年04期
• 关键词: 滑动变阻器 定值电阻 物理思维 示数 电源电压 电阻箱 滑片 失分 电流变化 实际功率

初中电学中有这样一个经典的电路,如图1所示,它既包含了电学中常见的用电器:定值电阻或小灯泡,又涉及了最重要的工具:滑动变阻器,以及电学测量仪器:电流表和电压表。以这个电路为载体设计的各种题型能很好的考察同学们的综合能力,包括处理信息的能力,综合应用能力、物理思维能力和创新意识。因此这样的电路在选择、实验、探究、解答题中均有出现,既是热点问题,又是平时考试中发现大家失分较多的问题。细探近几

There is such a classic circuit in junior high school, as shown in Figure 1, which contains both electrical appliances commonly used in electricity: fixed resistance or small bulb, but also the most important tools: sliding rheostat, and electrical measuring instruments: Ammeter and voltmeter. With this circuit as the carrier design of a variety of questions can be a good study of the students’ comprehensive ability, including the ability to handle information, comprehensive application ability, physical thinking ability and sense of innovation. Therefore, such a circuit in the choice, experiment, explore, answer questions have emerged, both hot issues, but also found that we lose points in the usual examination more problems. Probes in recent years