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电热器是我们日常生活中一种常见的用电设备,其工作原理是运用了电流的热效应,在中考试卷中出现的考查频率较多,特别是运用电功、电功率、焦耳定律来解答关于其档位问题的考查力度较大,所以同学们有必要对电热器的档位有一个清楚的认识.一、电热器的档位类型(一)两档问题1.原理一般情况下的电热器常设计成“高温档”(或“加热档”)和低温档“(或保温档”)两种,如电饭煲、饮水机等.根据公式P=U2/R知道,当电压一定时,电阻越大,电功率越小;电阻越小,电
Electric heater is a common electrical equipment in our daily life, its working principle is the use of the current thermal effects, test papers appear in the examination frequency more, especially the use of electrical work, electrical power, Joule’s law to answer questions about Therefore, it is necessary for the students to have a clear understanding of the gear position of the electric heater.First, the gear type of the electric heater (A) two gear problem 1 principle In general, the electric heater often Designed as a “high temperature file” (or “heating file ”) and low temperature file (or insulation file ), such as rice cookers, drinking fountains, etc. According to the formula P = U2 / R know that when the voltage Certainly, the greater the resistance, the smaller the electric power; the smaller the resistance, the electricity