2019年中考物理真题分类汇编——电功率计算专题.pdf

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1、学习资料收集于网络，仅供参考学习资料2019 年中考物理真题分类汇编电功率计算专题1.（2019 宜宾，18）如图所示电路中，已知电源电压保持不变，小灯泡L 的规格为“6V 3W”，滑动变阻器的最大阻值为30，R0 为定值电阻。（1）小灯泡 L 正常发光时的电流为多少？（2）只闭合开关 S1和 S2，将变阻器滑片从最左端a 向右滑动，当变阻器接入电路的阻值为 4时，小灯泡 L 恰好正常发光，则电源电压是多少？（3）只闭合开关S1和 S3，当滑片置于a 时，电压表示数为6V，电流表示数为0.2A，此时滑动变阻器消耗的电功率为1.2W，当滑片向右滑动到另外某个位置时，变阻器消耗的电功率仍然为1.2

2、W，试求在这个位置时电流表的示数。2.（2019 枣庄，31）节能减排，绿色环保，新能源汽车成为未来汽车发展的方向。某种型号纯电动汽车的部分参数如表：假如汽车上只有司机一人，质量为60kg，汽车以 60km/h 的速度匀速行驶 36km，耗电 9kW?h，汽车所受的阻力为汽车总重的0.05 倍。g10N/kg，试问：（1）电动机的工作原理是（选填“电流的磁效应”、“磁场对电流的作学习资料收集于网络，仅供参考学习资料用”）电动汽车前进和倒退是通过改变来改变电动机的转动方向的。（2）电动汽车对水平地面的压强是多少？（3）电动汽车牵引力所做的功是多大？（4）电动汽车电能转化为机械能的效率是多大？3.

3、（2019 枣庄，32）如图所示是某款电养生壶及其铭牌的部分参数，当养生壶正常工作时，求：（1）养生壶正常工作的电阻。（2）若该养生壶的加热效率为80%，在标准大气压下，将初温是12的一壶水烧开，需要多长时间？（c水4.2 103J/（kg?），水1.0 103kg/m3（3）在物理综合实践活动中，小明和小丽同学利用所学习的物理知识，合作测量养生壶的实际功率。电表上标着“1200r/（kW?h）”，他们把家中的其他用电器都与电源断开，仅让养生壶接入电路中烧水，2min 电能表的转盘转了40r，求电养容量生壶的实际功率。文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W

4、10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B

5、9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE1

6、0R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W

7、10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B

8、9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE1

9、0R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W

10、10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B9L10Z4D8 ZV1J1W10F3M10文档编码:CE10R5I8X10L3 HQ6B

11、9L10Z4D8 ZV1J1W10F3M10学习资料收集于网络，仅供参考学习资料4.（2019 河南，20）5.（2019 泰安，26）某电热水器具有加热和保温功能，其工作原理如图甲所示。其中控制电路中的电磁铁线圈电阻不计，R为热敏电阻，热敏电阻中允许通过的最大电流 I0=15mA，其电阻 R随温度变化的规律图像如图乙所示，电源电压U1恒为 6V。当电磁铁线圈中的电流I 8mA时，电磁铁的衔铁被吸下，继电器下方触文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2

12、J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L1

13、0V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV

14、2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F

15、6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY

16、4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10

17、I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档

18、编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5学习资料收集于网络，仅供参考学习资料点 a、b 接触，加热电路接通；当电磁铁线圈中的电流I 8mA时，继电器上方触点和触点 c 接触，保温电路接通。热敏电阻R和工作电路中的三只电阻丝R1、R2、R3均置于储水箱中，U2220V，加热时的功率 P加热2200W，保温时的功率 P保温110W，加热效率 90%，R22R1，水箱内最低温度为0，水的比热容

19、c水=4.2103J/（kg）。（1）为使控制电路正常工作，保护电阻R0的阻值至少为多大？若R0为该值，试求热水器刚开始保温时水的温度。（2）电阻丝R1、R2、R3的阻值分别为多少欧姆？（3）该热水器在加热状态下，将44 kg、20的水加热到 50需要多少时间？6.(2019 怀化，35)如图甲是定值电阻的和标有“8 V 8 W 灯泡 L 的 I-U 关系图象如图 乙所示.电源电压恒定不变,滑动变阻器的最大阻值为12。当开关 S、S2闭合,开关 S1断开，将滑动变阻器的滑片P滑到 b 端时，灯泡 L 的实际功率为 1W.求：（1）灯泡正常发光10s，电流通过灯泡产生的热量；文档编码:CK2J2

20、B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V

21、5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J

22、4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q

23、9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N

24、4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7

25、P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码

26、:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5学习资料收集于网络，仅供参考学习资料（2）电源电压；（3）当开关 S、S1、S2同时闭合，调节滑片P,求电路消耗的最大功率。7.(2019 济宁，)如图所示,电路中的电源电压不变。只用一根

27、导线连接b、c 时,电阻 R上的电压为 9.6V,通过灯泡 L 的电流为 0.2A;用一根导线连接a、b,一根导线连接 c、d 时,电阻 R与灯泡 L 的电功率之比为1:4,灯泡 L 正常发光。求(1)电阻 R的阻值;(2)灯泡 L 的额定电压;(3)只用一根导线连接c、d 时电路消耗的总功率文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6

28、Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4

29、N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I

30、7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编

31、码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J

32、2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10

33、V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2

34、J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5学习资料收集于网络，仅供参考学习资料8.（2019 长春，25）科技小组要测量额定电压为5V的小灯泡的电功率，可用的器材有：一个电压表和一个电流表（只有00.6A 量程可用）电源两端的电压恒定（1）按如图甲所示电路图确连接电路闭合开关前，将滑动变阻器滑片移到端（选填“左”或“右”）（2）闭合开关，记录电压表、电流表示数：调节滑动变阻器并记录多组数据当电流表示数为 0.6A 时，电压表示数低于 5V根据数据绘制出小灯泡的电流I 与电压 U的关系图像如图乙所示，由图像可知，

35、灯丝电阻随温度的升高而。（3）为测量小灯泡的额定功率，小组同学拆除电流表后再接通电路，调节滑动变阻器直至电压表示数为5V；保持滑动变阻器的滑片位置不变，断开开关，将电压表替换 AB间导线接入电路，闭合开关，电压表小数为5.4V，则此时小灯泡亮度比正常发光时：将滑动变阻器的滑片移到最左端，电压表示数变为 7.2V则小灯泡的额定功率为 W文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:C

36、K2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9

37、L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5

38、HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X

39、3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9

40、ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S

41、10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5

42、文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5学习资料收集于网络，仅供参考学习资料9.(2019天水,23)（已知 c煤油=2.1103J/（kg?），煤油=0.8 103kg/m3）（1）煤油温度升高20时，吸收了多少焦耳的热量？（2）R1的阻值是多少？（写出必要的文字说明）（3）某同学用两个阻值和R1、R2均相同的电热丝串联，制成一个新的电热器，将它接在家庭电路中工作l1min，产生的热量是多少？10.（2019 湘 西 州，27）下图是普通家用两档电取暖器内部简化电路

43、图，R1、R2为电热丝，且电阻不变，高温档位功率为1100W，低温档位功率为 440W，家庭文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档

44、编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2

45、J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L1

46、0V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV

47、2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F

48、6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY

49、4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5文档编码:CK2J2B9L10V5 HV2J4X3F6Q9 ZY4N4S10I7P5学习资料收集于网络，仅供参考学习资料电路电压 U=220V，求：（1）电取暖

50、器处于高温档位时电路中的电流强度；（2）电路中 R1的阻值；（3）如果普通家庭生活用电的电费价格为每度0.55 元，试计算用该电取暖器的低温档位取暖4 小时需要缴纳的电费。11.（2019 玉林，）某物理研究小组设计了一个压力报警装置，工作原理如图13 甲所示。OBA为水平杠杆、OA长 100cm，O为支点，OB：BA 1；4；已知报警器 R0的阻值恒为 10，压力传感器 R固定放置，压力传感器受到的压力F 与 R的阻值变化的关系如图.13 乙所示。当托盘空载时，闭合开关S，电压表的示数为 1V；当托盘所受的压力增大，电压表的示数达到2V时，报警器 R0开始发出报警信号。托盘、压杆和杠杆的质量