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编者：本文论述的主要概念是电功、电功率，主要规律是焦耳定律．生活用电及安全用电知识是电学理论联系实际的内容，既是初中电学知识的总结提高，也是科技领域和实际生活极为有用的知识与技能．在中考中占有重要的地位．纵观历届中考试题，可以看出，电学综合题常以“难度题?
Editor: The main concepts discussed in this paper are electric power and electric power. The main law is Joule’s law. The knowledge of electricity consumption and safe use of electricity is the content of the theory of electricity. It is not only a summary of the knowledge of junior high school electricity, but also an extremely useful knowledge and skill in the fields of science and technology and practical life. In the middle school exam occupies an important position. Looking at previous mid-term exam questions, we can see that the questions that are commonly used in electrical problems often refer to “difficult questions?