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1、2012中考物理压轴题训练一、一个实心小球先后放入盛有足够的水和足够多的酒精的两个容器中,小球受到的浮力分别是 0.9 牛和 0.8 牛,酒精的密谋为0.8103 kg/m3。1分析小球在水中和在酒精中的浮沉状态2求小球的密度二、体积为 1.010-3m3的正方体木块,投入如图1 所示装有水的容器中,静止后露出水面的高度为 510-2米,容器的底面积为0.04m2(g 取 10N/kg)。求:木块受到的浮力;木块的重力;投入木块后,容器底增加的压强若将此木块投入某液体中,露出液面高度为4 厘米,求这种液体的密度。解:三、如图 2 所示电路,电源电压不变,R1的阻值为 10 欧姆,闭合开关 S,
2、滑动变阻器的滑片滑到 b 点,电压表与的示数之比为 5:7,R2与 R 消耗的功率之和是 R1消耗功率的 4 倍,求:通过 R1与 R2的电流之比滑动变阻器的最大阻值Rab滑动变阻器滑片在a、b 两点时 R1消耗的功率比解:四、如图 3 所示,用滑轮组拉着重600N 的物体 A 沿水平方向匀速移动,在 40秒内物体移动了8 米,接力 F 做的功为 1280 焦。求:拉力 F 的大小及拉力的功率若动滑轮的重为12 牛(不计绳重及摩擦)计算滑轮组的机械效率解:图 1 图 2 图 3 五、如图 4 所示的电路中,R1、R2为定值电阻,灯 L 上标有“16V4W”的字样,电源电压保持不变。闭合开关 S
3、、S1、S2,电流表的示数为 0.35 安,此时,灯 L 恰能正常发光,求电阻 R1的大小;闭合开关 S,断开开关 S1、S2,电压表的示数较中变化了3.2 伏,求此时电阻 R2消耗的电功率(灯丝电阻不变)六、如图 5 所示电路中,电源电压保持不变,闭合开关S,已知当滑片P 分别滑至 a 端和 b端时,电阻 R1消耗的电功率之比P1:P2=9:4。当滑片在 a 端时,电流表的示数为3 安培,滑片P 在 b 端时,电压表的示数为6 伏特,求:电阻 R1的阻值和滑动变阻器的最大阻值R2电源电压是多少伏特七、如图 6 所示的电路中,R1=400 欧,R3=20 欧,电源电压 U=12 伏,且保持不变
4、,当S1、S2断开时,电流表的示数为0.1 安,求:R2的阻值S1、S2闭合时电流表的示数S1、S2闭合时,能电 10 秒钟电路产生的热量。LS1S2S图 4 S图 5 32图 6 文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码
5、:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2
6、 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2
7、ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档
8、编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4
9、A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U
10、2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8文档编码:CD8V9T10B4A2 HY7H6Y9Q2U2 ZZ7J6G4W1O8八、要把一只额定电流为0.2 安的小灯泡接入电压恒为9 伏的电源两端,为安全起见,
11、将小灯泡与一个滑动变阻器串联后接入电路,如图7 所示,开关闭合后,移动滑片,当滑动变阻器消耗的功率为1.04瓦时,小灯泡恰好正常发光。小灯泡的额定电压和额定功率分别是多少?小灯泡正常发光时,变阻器接入电路的阻值是多少移动变阻器滑片,当电路中电流为 0.1 安时,小灯泡的实际功率是多少(不计温度对灯丝电阴的影响)九、如图 8 所示,R1的阻值为 20 欧,开关 S 闭合后电流表 A 的示数为 2.7 安,电流表A1的示数为 1.8 安,求:电源的电压电表 R2的阻值电流通过电阻 R2每分钟所做的功电阻 R1、R2的电功率之比解:36V;40 欧;1944焦;2:1 十、如图 9 所示电路,电源电
12、压保持不变,闭合开关S,当变阻器滑片 P 在中点 a 处时,电压表读数为3 伏,电流表读数为0.6 安培;当滑片 P 在 b 端时,电压表读数为5 伏,电流表读数为0.5 安,请根据测得的数据计算出与电路有关的5 个物理量。十一、如图 10 所示,正方体木块漂浮在水面上,有总体积的1/5 露出水面,不可伸长的悬线处于松弛状态,已知绳可能承受的最大拉力为5N,木块边长为 0.1 米,容器底面积为 0.03米2,容器底有一阀门K,求:木块的密度;打开阀门使水缓慢流出,当细绳断裂的一瞬间关闭阀门,此时木块排开水的体积为多少?在绳断后,木块再次漂浮时,容器底受到水的压强与断绳的瞬间相比,窗口底受水的压
13、强怎样变化?改变了多少?(g 取 10 牛/千克,提示:相互作用的两个力总是等大的)图 7 图 8 图 9 图 10文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4
14、I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N
15、10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档
16、编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3
17、Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5
18、T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8
19、H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5十二、如图 11所示电路图中,小灯泡 L 上标有“8
20、V 3.2W”字样,滑动变阻器的最大值为40 欧,R1的阻值为 18 欧,求:小灯泡 L 的电阻S、S1、S2均闭合时,电压表的示数为9 伏,求电源电压及电阻 R1上消耗的电功率断开 S1、S2,闭合 S,若接入电路中的电压表的量程改为0-3伏,电流表的量程为0-0.6 安,为了保证两表均不超过量程,且小灯泡两端的电压不超过其额定电压,滑动变阻器的阻值变化范围为多少?8、一个实验用的电动机跟电流表串联后接在6V 直流稳压电源上,闭合开关后电动机并没有转动,这时电流表的读数为5A,检查发现电动机轴上的齿轮被卡住了,排除故障后,让电动机带动轻负载转动,这时电流表的读数为1A,由此可以求出电动机做机
21、械功的功率为多少 W?9、从商店买来一个电热毯,使用中有时感到温度太高,现想用一个开关和一个电阻把它改为两档,使电热毯单位时间的发热量,或为原来的数值,或为原来的一半,厂家说明书上只写着额定电压为 220V,没有其他电器指标,请你设计一个方案,完成这项改装,要求:(1)画出电路图;(2)导出所用电阻大小的计算式;(3)指明安装时必须注意的问题。图 11 文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N
22、10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档
23、编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3
24、Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5
25、T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8
26、H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9
27、H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4
28、I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I511、如图所 示,电源电压为9V 保持不变,灯 L 上标有“6V 6W”字样,滑动变阻器R1的最大阻值为 40,R2=20,灯泡的电阻不变。求:(1)灯泡的电阻。(2)当 S1断开,S2闭合,滑 动变阻器的滑片在最左端时,电路中的电流。(3)电路工作时消耗的最小功率。12.如图所示的电路,电源电压不变,滑动变阻器的最大阻值为20。闭合开关,当滑动变阻器的滑片 P 滑到 a 端时,小灯泡完全熄灭,电流表的示数为
29、0.3 A;当滑动变阻器的滑片P滑到 b 端时,小灯泡恰好正常发光,电流表示数为0.8 A。求(1)电源电压。(2)灯泡正常发光1min 消耗的电能。(3)灯泡正常发光时,电路的总电阻。13、在如图所示的电路中,闭合开关S,电压表 V 的示数恒为 6V,电流表的示数为0.5A,电压表 V2的示数为 4V。当把滑动变阻器的滑片移至最右端时,电流表的示数为0.3A。求:(1)R1的阻值;(2)滑动变阻器的最大阻值;(3)电路消耗的最小总功率;(4)当滑动变阻器的滑片移至最左端时,R1在 5min 内消耗的电能。14、如图甲所示电路,电源电压为6V 不变,滑动变阻器的滑片P 从 a 端移动到 b 端
30、,定值电阻 R1两端的电压随滑动变阻器R2阻值变化的图像如图乙所示。问:S2 LS1 R2R1 P R1 A S L ab文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7
31、ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10
32、E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I
33、5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:
34、CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E
35、5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9
36、HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5(1)当 R2为 10时,电压表的示数是多少?
37、(2)当电压表示数为2V 时,R1的阻值是多少?(3)滑动变阻器的滑片P 在 b 端时,电阻 R1的功率是多少?15、在如图所示的电路中,电流表的量程为00.6A,电压表的最程为03V,R34。求(画出相应的等效电路图):(1)只闭合开关 S1时,电路消耗的功率为4W,则电源电压 U=?(2)只闭合开关 S2时,灯泡 R,1正常发光,R3消耗的功率为 0.64W,则灯泡的电阻 R1=?(写出该小题的解题思路后再求解)(3)只闭合开 S3时,在不损坏电流表、电压表和灯泡的情况下,则变阻器R2的取值范围是多少?16、(10 菏泽)(7 分)如图 18 所示,灯泡 L 标有“6V,3W”字样,滑动变
38、阻器的最大值为12,当开关 S1、S2闭合,滑动变阻器的滑片P 滑到最右端时,小灯泡恰好正常发光。求:(1)灯泡的电阻(2)电源电压(3)当开关 S1闭合、S2断开时,滑片移到变阻器的最左端,求灯泡的功率17、(8 分)现有两个电路元件定值电阻R1和热敏电阻 R2(电阻随温度改变而改变,且对温度很敏感),它们各自的电流与两端电压的关系如图甲所示。将这两个电路元件接入图乙所示的电路中,电源电压为6V。当电流表读数为 70 mA 时,求:(1)定值电阻 R1的阻值;(2)通过热敏电阻 R2的电流;(3)R2的电阻;RL1S2S图 18 文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE
39、4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1
40、N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文
41、档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH
42、3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S
43、5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC
44、8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M
45、9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5(4)电源的总功率。18.电动自行车(简称电动车,其核心部分是一个电动机)以其无废气污染、操作方便、价格适中等优点,倍受人们的青睐。当质量为50kg 的人驾驶着质量为50kg 的电动车,在水平的路面上以 18km h 的速度正常匀
46、速行驶时,所受到的阻力为压力的0.03 倍。则:(g 10N kg)(1)此时电动车受到的牵引力为多少?(2)在正常行驶 5min 的时间内,电动车的牵引力做的功为多少?(3)如果电动机的额定电压为48V,在正常行驶的过程中,通过电动机线圈的电流为 4A,那么,电动机的机械效率为多少?19.在某建筑工地上,为了搬运建筑材料,常常采用如图所示的简单机械。示意图中滑轮A与滑车连接,滑轮 D固定在地面塔架上。钢丝绳拉力由电动机提供,电动机的效率为60%。此滑轮组在 2 分钟内将质量为0.48 吨的建筑材料匀速提升12 米,所用的拉力做的功为7.92104焦(钢丝绳重和摩擦不计,g 取 10 Nkg)
47、。求:(1)滑轮组的机械效率。(2)钢丝绳拉动的速度。(3)如果提供动力的电动机在220V的电压下正常工作,求此过程中流过电动机的电流。20.同学们研制了一种测量手压力大小的电子称,其测力部分的原理如图甲所示,它主要由手压板、杠杆 OAB,压力传感器R(电阻值会随所受压力的大小发生变化的变阻器)和显示压力大小的仪器 A(实质是电流表)构成,其中OAOB=12,且已知压力传感器R 的电阻与它所受的压力F 的关系如图乙所示。接通电源后,压力传感器两端的电压横为4.8V。手压板和杠杆的质量不计。求:(1)若某同学对手压板的压力为400N 时,压力传感器上受的压力多大?此时,电流表的示数多大?(800
48、N;0.024A)(2)若压力传感器R 表面能承受的最大压强为4106pa,压力杆与压力传感器之间的接触面积是 3cm2,则压力传感器 R 表面能承受最大压力为多大?(1200N)(3)该电子称的测量范围。(0600N)文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4
49、J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7
50、 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I10E1N10I5文档编码:CH3Q8E5S5T9 HC8H4J1M9H7 ZE4I1