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传统的自感现象演示实验,不能揭示自感的实质.为此,笔者经过多年的教学实践,对自感现象演示实验进行了研究,并总结了实验方法和实验过程,在此与教育界同仁共商. 相似文献
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自感现象是一种特殊的电磁感应现象,学生对自感现象缺乏感性认识,教材是在演示实验的基础上讲述自感现象的.传统的演示是先演示通路时的自感现象,再演示断路时的自感现象,这种演示分别用两个电路来完成,如图1、2所示. 相似文献
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本刊2011年第10期刊登了《自感现象实验的改进》一文.在实验改进方案一“用‘通电自感’电路演示通、断电自感现象”中,提出用如图1(原文图3,下同)所示电路演示通、断电自感现象.笔者按文中内容操作,使用图1电路进行的通电自感实验,不能观察到原文描述的“D1滞后于D2正常发光”的演示效果. 相似文献
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采用发光二极管对电磁感应现象、自感现象、互感现象和电磁振荡等演示实验进行了改进,明显地提高了实验效果. 相似文献
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目前,一些中学或中专物理教材中,对自感现象的演示装置常采用图1和图2所示的电路.图1用于演示通电自感现象,图2用于演示断电自感现象.实际教学中,由于实验装置常采用1.5V小灯泡亮度较小,A、B两灯泡达到相同亮度的时间差也较短,自感现象不是太明显.另外由于两个电路是独立的,容易让学生产生这样的误解:图1所示的装置,在通电时有自感现象,在断电时没有自感现象;图2所示的装置,在断电时有自感现象,在通电时无自感现象.为了使自感现象明显,同时消除学生的误解,我们对这一演示装置重新进行了设计和改进. 相似文献
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实验的改进和创新要求我们从新的视角对原有实验进行审视、找出不足.高中物理课程标准实验教科书物理<选修3-2>"自感现象"一节中,该传统教具在演示自感现象时存在诸多不足. 相似文献
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1引言
文献[1]中为了让学生了解自感电动势的作用,推荐了两个演示实验.其中一个是演示通电自感现象(图1),另一个是演示断电自感现象(图2). 相似文献
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An oscillation phenomenon of the reverberation intensity was observed in a recent shallow water reverberation experiment. This phenomenon cannot be explained by the widely used incoherent reverberation theory. In this paper, to explain the observed oscillation phenomenon, the modal interference of reverberation in the shallow water with a thermocline is discussed on the basis of the ray-mode theory. The theoretical analysis and numerical results show that modal interference can cause the regular oscillation phenomenon of the reverberation intensity, and the oscillation phenomenon of the reverberation intensity can be used to test different reverberation models. 相似文献
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讨论了两列光波发生干涉现象的理想化条件和在实验中能否观察到干涉现象发生的操作性条件,推导了各种情况下的理论公式。从工程应用的角度出发,研究了检测仪器的响应时间T和光强分辨能力对观察光的干涉现象的影响,提出了观察光的干涉现象的第四个必要条件,对在各种情况下应用光的干涉现象有一定的指导作用。 相似文献
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A phenomenon of light radiation from miniature silicon balls produced at arc discharge and immersed in water is described. Video film showing shining balls in a vessel with water is presented. An explanation of this phenomenon is considered. Similarities and differences of this phenomenon with a phenomenon of ball lightning are analyzed. 相似文献
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The two-phase behaviour in financial markets actually means the bifurcation phenomenon, which represents the change of the conditional probability from an unimodal to a bimodal distribution. We investigate the bifurcation phenomenon in Hang-Sang index. It is observed that the bifurcation phenomenon in financial index is not universal, but specific under certain conditions. For Hang-Sang index and randomly generated time series, the phenomenon just emerges when the power-law exponent of absolute increment distribution is between 1 and 2 with appropriate period. Simulations on a randomly generated time series suggest the bifurcation phenomenon itself is subject to the statistics of absolute increment, thus it may not be able to reflect essential financial behaviours. However, even under the same distribution of absolute increment, the range where bifurcation phenomenon occurs is fax different from real market to artificial data, which may reflect certain market information. 相似文献
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