“理想变压器”是电磁感应现象的一个典型应用,是该部分知识的提高和升华,它与电路、电磁场、电磁波联系紧密,在实际生活和生产中有着广泛的应用.《课程标准》规定:能尝试运用有关的物理知识和技能解释一些自然现象和生活中的问题;能运用物理原理 “Ideal Transformer” is a typical application of the phenomenon of electromagnetic induction, which is the improvement and sublimation of this part of knowledge. It is closely related to circuits, electromagnetic fields and electromagnetic waves and has a wide range of applications in real life and production. : Can try to use the relevant physical knowledge and skills to explain some of the natural phenomena and problems in life; can use the physical principles