专题七时电学实验概要.pptx

图图2 2答案答案：B BA A：断开断开22 22 答案答案CD答案答案见图见图20 20 闭合闭合0.69 0.69 小小答案答案(1)(1)I I1 1R R0 0(2)2.90(2)2.904.04.0(3)5.6(3)5.6图图6 6实验次数实验次数1 12 23 34 45 56 67 7长度长度L L(cm)(cm)20.020.025.025.030.030.035.035.040.040.045.045.050.050.0电阻电阻R R(k)(k)1.31.32.12.13.03.04.14.15.35.36.76.78.48.4图图7 7U U/V/V0 00.30.30.50.50.70.71 11.21.21.51.51.71.72 22.22.2I I/A/A0 00.080.08 0.130.13 0.180.18 0.250.25 0.300.30 0.360.36 0.390.39 0.430.43 0.450.45图图9 9序号序号实验器材实验器材参数或用途参数或用途1 1金属丝金属丝(L L)长度为长度为L L0 0直径为直径为D D2 2电流表电流表(A(A1 1)量程量程10 mA10 mA内阻内阻r r1 140 40 3 3电流表电流表(A(A2 2)量程量程500 A500 A内阻内阻r r2 2750 750 4 4电阻电阻(R R1 1)阻值约为阻值约为100 100 起保护作用起保护作用5 5滑动变阻器滑动变阻器(R R2 2)总阻值约总阻值约20 20 6 6电池电池(E E)电动势电动势1.5 V1.5 V内阻很小内阻很小7 7开关开关(S)(S)8 8导线若干导线若干图图1212图图1313图图1414答案答案(1)(1)如图所示如图所示(2)(2)很大很大1 000(9651 000(96510401040都对都对)图图1616I I(A)(A)0.200.200.280.280.360.360.440.440.520.520.600.60U U(V)(V)3.003.002.602.602.202.201.801.801.401.401.001.00UIUI(W)(W)0.600.600.730.730.790.790.790.790.730.730.600.60图图18182.062.06220220