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电学实验和生产生活用电中,每个电路元件的铭牌上都标有该元件的规格.一般用电器上会标注额定电压U_额、额定电流I_额、额定功率P_额、电阻R这四个物理量中的两个量(另两个物理量可通过公式计算得出),使用时要看清电路元件上的铭牌标记,注意使用安全,防止烧坏.如果电路中有电流表、电压表,则要注意不能超过量程.纵观历年中考试题中的电学计算题,涉及元件安全使用的题目很多,主要有以下几种题型.
Electrical experiments and production and living electricity, the nameplate of each circuit components are marked with the specifications of the components.General appliances will be marked with rated voltage U_, rated current I_, rated power P_, resistance R Two of the four physical quantities (the other two physical quantities can be calculated by the formula), the use of the circuit components to see the nameplate mark, pay attention to the use of safety, to prevent burn out if the circuit has ammeter, voltmeter , We must pay attention to the range can not be exceeded.View through the years in the exam questions in the electrical calculation problems involved in the safe use of many topics, there are several questions.