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数形结合是一种重要的数学思想方法。由于物理学和数学有着十分密切地联系,因而数形结合思想在物理学中有广泛的应用。物理图象便是这种科学思想方法在物理学中最主要的表现形式。一些比较抽象的物理概念和规律的教学,若从数形结合的思想观点出发,恰当地引入物理图象,则可变抽象为形象、化虚幻为直观,便于突破难点疑点。例如,关于电源输出功率P随外电阻R变化
The combination of number and shape is an important mathematical thinking method. Since physics and mathematics are very closely related, the idea of combination of numbers and shapes is widely used in physics. The physical image is the main manifestation of this method of scientific thinking in physics. Some relatively abstract teachings of physics concepts and laws, starting from the viewpoint of the combination of numbers and shapes, and properly introducing physical images, can make variable abstractions into images and illusions into intuitions, making it easier to break through difficult points. For example, regarding the power output power P changes with the external resistance R