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1.U—I法例1测量电源B的电动势E及内阻r(E约为4.5V,r约为1.5Ω).器材:量程3V的理想电压表,量程0.5A的电流表A(具有一定内阻),固定电阻R=4Ω,滑动变阻器R′,电键S,导线若干.(1)画出实验电路原理图.图中各元件需用题目中给出的符号或字母标出.(2)实验中,当电流表读数为I_1时,电压表读数为U_1;当电流表读数为I_2时,电压表读数为U_2.则可求出E=__,r=__.(用I_1、I_2、U_1、U_2及R表示)(05年全国卷Ⅰ)..
1.U-I Law 1 measures the electromotive force E and internal resistance r of power supply B (E is about 4.5V, r is about 1.5Ω). Equipment: ideal voltmeter with a range of 3V, ammeter A with a range of 0.5A (with certain internal Resistor), fixed resistance R=4Ω, sliding rheostat R′, key S, number of wires. (1) Draw the experimental circuit schematic. Each element in the figure should be marked with the symbol or letter given in the title. (2) In the experiment, when the ammeter reading is I_1, the voltmeter reads U_1; when the ammeter reads I_2, the voltmeter reads U_2. Then E=__, r=__. (using I_1, I_2, U_1, U_2 And R said) (05 National Vol. I)..