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电学知识是初中物理的重点和难点。本文就初三物理第一学期电学重点知识简析如下。1 正确使用电流表和电压表 用电流表和电压表测量电流强度和电压时应特别注意的是,电流表和电压表在接入电路前,首先应估计被测电路中的电流和被测电路两端的电压,再选用合适的量程将电流表和电压表接入电路中。若被测电路中的电流或被测电路两端的电压不能估计时,应首先接大量程试触,同时认真观察指针偏转是否正常。
Electrical knowledge is the focus and difficulty of junior high school physics. This article briefly analyzes the key knowledge of electricity in the first semester of junior high school. 1 Correct use of ammeters and voltmeters When measuring amperage and voltage with ammeters and voltmeters, special attention should be paid to the fact that before the ammeter and voltmeter are connected to a circuit, the current in the circuit under test and the voltage across the circuit under test must be estimated. Then select the appropriate range to connect the ammeter and voltmeter to the circuit. If the current in the circuit under test or the voltage across the circuit under test cannot be estimated, it should first be connected with a large number of test touches, and at the same time carefully observe whether the pointer deflection is normal.