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焦耳定律是中学物理中的重要定律,它阐述与研究的是通电导体所发出的热量与电流、导体电阻和通电时间的关系.同学们在学习这部分知识时,可从以下四个方面进行剖析.一、电流的热效应电流通过导体时,导体发热的现象称为电流的热效应.电热器就是利用电流的热效应制成的,是利用电流做功、将电能转化为内能的装置.电热毯、电饭锅、电热水器都是常见的电热器.电热器的主要组成部分是发热体,由电阻率大、熔点高的合金丝绕在绝缘材料上制成的.
Joule’s law is an important law in high school physics, which expounds and studies the relationship between heat and current, conductor resistance and power-on time of energized conductors. Students can analyze this part of knowledge from the following four aspects The thermal effect of electric current When the electric current flows through the conductor, the phenomenon that the conductor heats up is called the thermal effect of the electric current. The electric heater is made by utilizing the thermal effect of the electric current, is the device that makes use of electric current to make the electric energy into internal energy. Electric cooker, electric water heater is a common electric heater. The main part of the electric heater is a heating element, made of insulating material with high resistivity and high melting point.