(完整word版)初中物理电功率计算题专题.pdf

R1R2S1S2A 电功率复习题1.一只标有“PZ22040”和一只标有“PZ220100”的灯泡，若：(1)把它们并联在220V 的电源上，问哪盏灯亮些？(2)把它们串联在220V的电源上，哪盏灯亮些？2.有一个标有“8V，2W”的小灯泡，如果接到12V 的电源上必须如何联接一个阻值多大的电阻？才能使小灯泡正常发光，此时这个电阻上消耗的电功率是多少W？3.现有两个小灯泡，上面分别标有“6V，1.2W”和“12V，6W”字样，如果把这两个灯泡串联起来，为了使其中一个灯泡持续正常发光，那么加在串联电路两端的电压是多少？4.某校教学大楼有教室24 间，每间教室装有“PZ220-40”白炽灯6 只。（1）求引入大楼照明线中的电流；（2）若平均每日用电3h，每月以30 日计，每月耗电多少度？5.将“PZ220 100”的灯泡与总电阻是121 的滑动变阻器串联起来，接到220V的电源上，如图 99 示，调整滑动变阻器的阻值时，可使电灯的功率在多大范围内变化？6.(2007茂名市)(9 分)如图所示，当开关1S闭合时，电流表 A的示数为AI11；开关1S、2S同时闭合时，电流表 A的示数为AI5.12。已知电阻121R，求：(1)电源的电压；(2)电阻2R的大小；(3)电阻2R的电功率。7.(2007 年福建省宁德市)（6 分）标有“6V 3W”的小灯泡L 与额定功率为6W的电阻器R按如图电路连接，闭合开关S时，灯 L 正常发光，且电流表示数为0.75A。求：（）电阻器 R 的阻值；（）整个电路消耗的实际功率。8(2007 年上海市)在右图所示的电路中，电源电压保持不变，电阻R1 的阻值为20 欧。闭合电键S,电流表 A1的示数为0.3 安，电流表A2的示数为 0.2 安。求：(1)电源电压 U。(2)电阻 R2的阻值。(3)通电 10 秒，电流通过电阻 R2 做的功 W2。9.(2007徐州市)如图 11 所示电路，电源电压为45V，R1阻值为 5，滑动变阻器R2最大阻值为 20，电流表量程为006A，电压表量程为03V。求：(1)滑动变阻器允许接入电路的阻值范围；(2)正常工作时整个电路消耗的最大功率。14.(2007扬州市)在图 26 的电路中，电源电压为9V 且保持不变，电流表的规格为“006A”，电压表的规格为“015V”，灯泡上标有“6V 6W”字样，灯泡电流随电压变化关系如图27 所示，求：(1)灯泡正常发光时的电流。(2)当电流表示数为04A时，电压表的示数。(3)为了保证电路安全，滑动变阻器接人电路中的最小阻值及此时电路消耗的总功率。15(2007 成都市)（5 分）某品牌电热水壶的铭牌上标着如下表所示的数据。请计算：（1）该电热水壶的电阻；（1 分）（2）当电热水壶装满水后，从 20加热到100，水吸收的热量；（2分）（3）在额定电压下，要放出这些热量，电热水壶工作的时间。（不计热量损失）（1 分）（4）如果在用电高峰时间内用电热水壶烧水，电压只有200V左右，这时电热水壶发热时的功率大约是多大?（1 分）热水壶容量2.0L 额定电压220V 加热时功率800W 频率50Hz 16(2007 江西省)中考前,由于气温偏高,瑞瑞的妈妈为了让他有一个更好的学习环境，特地买了一台冷热两用的空调安装在他的房间.这台空调的说明书中主要数据如表，问：(1)空调工作时应选下图中孔插座.(2)空调正常制冷时电流为多少？连续正常制冷30min消耗的电能为多少kW h？(3)夏天由于空调使用较多，供电系统负荷增大，应如何使用空调有利于节能？（答出一点即可）17(常德市)如图所示，电源电压保持不变，S断开时，L 正常发光，电路的功率为4W；S闭合时，电路的总功率为9W，此时通过R的电流为0.5A。求：（1）灯泡的额定电压；（2）灯泡的电阻。18.(四川省自贡市)（6 分）如右图所示的电路，电源电压保持不变，电灯L 上标有“6V 12W”电源电压220V 频率50H额定制冷功率1320W 额定制热功率1420W LRSa b 文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5字样，当开关S1闭合，S2断开时，电灯恰好正常发光，电压表读数为4V，求：（1）电源电压和电阻R0的阻值。（2）当开关S1、S2都闭合时，电阻R0消耗的功率是多少？19.如图所示，电源电压为12V，并且保持不变，滑动变阻器的最大阻值为18，小灯泡上标有“6V 3W”字样。求：(1)灯泡的电阻和正常工作时的电流是多少？(2)当 S闭合，S1、S2都断开时，要使灯泡正常工作，滑动变阻器接入电路中的阻值为多大？(3)保持滑动变阻器的位置不变，闭合S、S1、S2，此时电流表示数变化了1A，求 R0的阻值是多少？(4)闭合S、S1、S2，调节滑动变阻器，使整个电路消耗的总功率为最小，这个最小值是多少？20.如图所示,电源电压恒为6V,R1、R2是定值电阻，滑动变阻器最大值为R，当断开 S2、S3、闭合 S1时，移动滑片P，电路消耗功率的最大值和最小值之比为4：1;当断开S1和 S3、闭合 S2时，滑片 P在 a 点（此时滑动变阻器连入电路中的电阻为1/4R）和在最右端电流表的示数之比2：1；当 S1、S2、S3都闭合时，电流表的示数为1.25A求:R1和 R的比值;R2和 R的比值;R1、R2、R3的值。21(2007 扬州市)在图 26 的电路中，电源电压为9V且保持不变，电流表的规格为“006A”，电压表的规格为“015V”，灯泡上标有“6V 6W”字样，灯泡电流随电压变化关系如图27 所示，求：(1)灯泡正常发光时的电流。(2)当电流表示数为04A时，电压表的示数。(3)为了保证电路安全，滑动变阻器接人电路中的最小阻值及此时电路消耗的总功率。22.(桂林市)在探究“家用电器”的综合实践活动中，小明与同学合作，在爸爸的协助下，以家里的电水壶为观察、研究对象，记录了如下表中的有关数据。根据上表中的记录，请解答下面的问题。（1）求通电2min 壶中的水吸收的热量；c水4.2 103J/（kg）（2）求电水壶中发热体正常工作时的电阻值；（3）求 2min 内电水壶消耗的电能和实际功率。23.(2007镇江市)某导体两端加2V 电压时，通过的电流为05A，则这段导体的电阻为_要使通过该导体的电流变为1A，应在该导体两端加_V电压 当该导体两端的电压为3V 时，该导体所消耗的电功率为_W 4.(河南省)3 月欧盟峰会通过了一项协议：在之前，欧洲各国将彻底终结“白炽灯时代”，推广使用节能灯。如图16 所示，一只“220V 11 W”的节能灯与一只“220 V 60W”的白炽灯发光效果相当。(1)兰兰的台灯用的是“220V 60W”的白炽灯，它正常发光时的电流是多少?(2)兰兰用一只11W的节能灯取代了台灯上的白炽灯，一年中台灯工作的时间2000h 算，可R P A S3R1R2a S1S2文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5节约多少度电?(3)兰兰了解到白炽灯的发光效率大约只有8，图 17 表示了它工作时的能量转化情况，请计算这尽60w的白炽灯一年工作2000h，会白白浪费掉多少电能?24.(河 北 省)小明看到他家5 月份的电费缴费通知单，这个月的用电量是116kW h，过去他家每个月的用电量在90kW h100kW h 之间，家里没有增添新的电器且用电器工作的时间与过去基本相同，5 月份为什么会用这么多电呢？于是，小明将一个标准的灯泡（220V 100W）单独连入了家庭电路中，用调节好的电压表测出了其两端电压为198V，观察到电能表（3000转/千瓦时）的铝盘在10min 内转过了50 转。（灯丝电阻不变）求：（1）灯泡的灯丝电阻多大？（2）灯泡消耗的实际功率多大？（3）10min 灯泡消耗多少电能？（4）请通过计算分析小明家的电能表是否存在问题。25.(2007济宁市)下图是家庭常用的电热水壶。（1）结合你对电热水壶的了解，就电热水壶的结构和使用过程中出现的一些现象，提出一个与物理有关的问题，并给出简要回答。示例：问题：用电热水壶烧水时，壶嘴为什么冒白汽？答：是水蒸气从壶嘴冒出后，遇冷液化形成小水珠的缘故。问题:。答：。（2）暑假里的一天，李红去商店购买电热水壶,售货员给他了一份推销牌电热水壶的宣传广告，其内容如下：请你根据上面提供的信息，计算：电热水壶正常工作时的电阻是多少？电热水壶正常工作3 分钟消耗多少电能？请你估计本地夏季自然界中水的温度为_，根据你的估计值，若将一壶水烧开需要吸收多少热量？C水=4.2 103J/(kg )气压为 1 标准大气压 （4）请你就广告内容作出评价是否可信？26.如图所示，1202R，小灯泡 L 标有“6V，3W”字样，滑动变阻器R1的最大电阻为80。（1）当 S1、S2都断开时，调节滑动变阻器使小灯泡正常发光，这时滑动变阻器连入电路的阻值为16，求：小灯泡的电阻？电压表的示数？（2）当开关S1、S2都闭合时，说明电路连接情况，求电路消耗的最小电功率？S2S1R1LVR2牌电热水壶名牌额定电压220V 额定功率1000W 容积2L 超温保护器熔断温度 110高效、节能、省时、烧一壶水仅用3分钟！牌电热水壶优点：文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 HT1O8N2D3R10 ZX5D5B6G5I5文档编码:CG8D8W9V8U10 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