论文部分内容阅读
题目如图1所示,闭合电路的电动势为 E,内阻不计,外电路的电阻 R_1与 R_2并联,且 R_1>R_2,电流表的内阻为 R_A.将电流表接入电路的口点(即串联于干路中),电流表的示数为 I;若将电流表接入电路中的 b 点(即与电阻 R_1串联),电流表的示数为I_1;若将电流表接在 c 点(即与电阻 R_2串联),电流表的示数为 I_2;则以下判断中正确的是( )
The problem is shown in Figure 1. The closed-circuit electromotive force is E, and the internal resistance is not counted. The resistance of the external circuit R_1 and R_2 is connected in parallel, and R_1>R_2. The internal resistance of the ammeter is R_A. Connect the ammeter to the point of the circuit (that is, series connection). In the trunk, the ammeter is shown as I; if the ammeter is connected to point b in the circuit (that is, in series with the resistor R_1), the current meter is shown as I_1; if the ammeter is connected to point c (ie, with the resistor R_2) In series), the current meter shows the number of I_2; then the following judgment is correct ()