51fly国际课程 (51fly.win)

 找回密码
 立即注册

手机扫一扫，访问本页面

 

      

上传图片附件

未使用图片

小贴士: 允许的图片文件格式为: gif, jpg, jpeg, png, webp，上传完成后会在上方生成预览，用鼠标连续双击缩略图，或拖动缩略图，该图片就被绑定至本题，显示在题目下方

本次作答已使用

小贴士: 此栏目显示的是当前作答使用的所有图片，绑定到某一题目的图片同时会显示在该题目下方; 删除使用的图片会将其转移到<未使用图片>类别

Switch to Full Screen

习题练习：Physics Unit18: Electric Currents
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 76，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test76.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics  发布日期: 2022-08-17 11:19    总分: 80分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月17日 11:19  切换到: 整卷模式

标记此题
1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A device that produces electricigogu/oqb0gprh 467 5nty by transforming chemical energy into electrical 6n oq/4 rhgb7ggo0u5p energy is called a

参考答案:    
标记此题
2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car battery

参考答案:    
标记此题
3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total amount of charge t jt.j dm0,mo3jp b32aphat passes through a wire's full cross section at any point per unit of time is refjbj.pm2m3t pja3 ,0oderred to as

参考答案:    
标记此题
4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The direction of convention current is taken to be the direc ij* qcmn;pz- 1x3b-oqtion that

参考答案:    
标记此题
5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coulomb per second is8(wk5rhda vt,cqd 9/ca( uwv6o t8c v/ the same as

参考答案:    
标记此题
6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car batteries are rated in "afdjl soeelfe 7he a l-s0j0ea44e94 (/mp-hours." This is a measure of their

参考答案:    
标记此题
7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistance of a wire is defined +r9 chpwg0her6 f 8nz-as

参考答案:    
标记此题
8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is $1 \; \Omega$ equivalent to?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistance of a wire h.92 nygx. hjoox 5c1cis

参考答案:    
标记此题
10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistivity of a wire dep,pknm) c4 0v/hontr7n)ay2cmv cz5 j .ends on

参考答案:    
标记此题
11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting material has the lcq2y5 okis20b owest resistivity value?

参考答案:    
标记此题
12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wires. One has twice thr lgtj c l:04ywy /*oxyl970.; mrnflie length of the other. How do the resistivitiec xy*0f;oml7:ryl iw/ g4.9 tlny0rj ls of these two wires compare?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wires. One: pecqkndjm8 ,i2:m i;ozh ,(j has twice the length of the other. How do the re m d8:hiqnz (2ik,;,e:pm jcojsistances of these two wires compare?

参考答案:    
标记此题
14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wires. One has twice the cross-sectional area o pm6;pl p fca14p0b:j3 x5vhfs:0qvaqf the other. How do the resistancea 31; 4:aqxpsfjb0 ppv m p0fhc:6l5vqs of these two wires compare?

参考答案:    
标记此题
15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wires. One has twice the le.ro xo:r-lyv 3ngth and twice the cross-sectional area of the other. How do tho:r l3-xr v.yoe resistances of these two wires compare?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The length of a wire is doubled anda81jlhx. -0b(vcsx sd the radius is doubled. By what factor does the resistance chang -0(bls8c1sjdav x.hxe?

参考答案:    
标记此题
17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much more resistance does a 1.0 cm diameter rod have compared t1k2 3fmmubyyg u ko8+),4v+ pf ytcz.qo a 2.0 cm diameter rod of the same length and made of t c f+y.2pgqk t4mu u3 fbkzv1,mo8y+y)he same material?

参考答案:    
标记此题
18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistivity of most ce )f)il.,k0vjb-mght ommon metals

参考答案:    
标记此题
19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature:7 ex2z xmqw f(3a,ss*/gww,, kxx qk+f 9licf coefficients of resistivity

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is 1 W equivalen; vgk.08qw: e +uaq-lyud3nvm+b,,q idn.szct to?

参考答案:    
标记此题
21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A kilowatt-hour is equivale0; 9m0x3cp a3nns gdirnt to

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the resistance in a constant voltage circuit is doubled, th4bohuf fbg h ny 8i4e01o4y+m3e power dissipated by thau4h0ifbm4ohyeoy4 g8b 3fn+ 1t circuit will

参考答案:    
标记此题
23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the voltage across a circuit of constant resista 23yzpde9 q pv 31johu-ao0w5snce is doubled, the power dissipated by that circuit wip2jqs 5oup10w z3 y 9-d3eovahll

参考答案:    
标记此题
24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the resistance in a circuit with constant current flowing is doubq18ddn+:ut90z x-+7rcg(v h ovlyurj led, the power di90rnucrdt1q8(vz7 +jul+ d y:ho- vxgssipated by that circuit will

参考答案:    
标记此题
25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the current flowing through a circui9bh/psq l6)qs9 qwaj8 gdo9p. t of constant resistance is doubled, the power dissipated by that 8qhlwoq9ja s69.) pd/b sp9qgcircuit will

参考答案:    
标记此题
26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  During a power demand, thesn3ap gg(6e/ h/c zdf2 voltage output is reduced by 5.0%. By what percentage is the power on a resist( /d2fgn3gpshe/cz 6 aor affected?

参考答案:    
标记此题
27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A current that is sinusoidal with respect to time is riw)l1fgdrb7 3d.x b)h- lyx0e eferred to as

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wires each: yafl9ebx6 c22 i4bwd carrying a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to that inw2c69ef2l:y ibx 4dab the larger diameter wire is

参考答案:    
标记此题
29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Materials in which the resistivity becomes essentially zero at very low temperatw cdzuzdtb 7 we-aqx(h-+ )p-:ures)p uz-tb:ex-da z(wh+7q cd -w are referred to as

参考答案:    
标记此题
30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current is flowing if 0.67 C of charge pass a point w iq bb gfmxf72(5,3bjin 0.30 s?

参考答案:    
标记此题
31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charge of 12 C passes through an electroplating apparatus in 2.0 min),dn/orswg3y stkk -vq (iu+ ,. What is the averagk,+rustws q-iv(n3 go)ykd ,/ e current?

参考答案:    
标记此题
32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much charge must pass by a point 9vk0 zqrho2by7ty29t in 10 s for the current to be 0.50 A?

参考答案:    
标记此题
33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A total of $2.0 \times 10^{13} \; protons$ pass a given point in 15 s. What is the current?

参考答案:    
标记此题
34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current is flowin9t/a --5u wh.v cvozqzg if $4.0 \times 10^{16} \; electrons$ pass a point in 0.50 s?

参考答案:    
标记此题
35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If $3.0 \times 10^{15} \; electrons$ flow through a section of a wire of diameter 2.0 mm in 4.0 s, what is the current in the wire?

参考答案:    
标记此题
36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coffee maker, which draws 13.5 A of current, has been left on for kvvm bpc ,01i*10 min. What icmvp1b 0,* kvis the net number of electrons that have passed through the coffee maker?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In an electroplating process, it is desired to deposit 40 mg of silver on bp brmiqt4 wsy+vk/5h, k)- kf9 6ds8la metal part by using a current of 2.0 A. How long must the current be allowed to run to deposit this much silver? (The silver ions are singly charged, and the atomi9 ip84-tsb / k6ld ks,kmq5hwfr+v )byc weight of silver is 108.)

参考答案:    
标记此题
38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What potential differencewo hny5 i7pu7, is required to cause 4.00 A to flow through a resistance ooy7, wi5u hpn7f 330 W?

参考答案:    
标记此题
39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the voltage across ax- c4 w4,b dae+ 5jr8kycvi6; geih:yk 5.0-W resistor if the current through it is 5.0 A?

参考答案:    
标记此题
40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4000-W resistor is connected ar;wql8ji s7jewhbd i34 z mf2 el:89)fcross 220 V. What current will flow?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A light bulb operating at 110 V draws 1.40 A of current;r5ps ql eqo-ut1, tkc9*vk3f. What is its resistance vrf t sk1qo9uq5l-c*etp ,3;k?

参考答案:    
标记此题
42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-V battery is connected to a 100-W resistor. How many electronqjtsbt, w a5,)s flow through the ww),bs5,tj atq ire in
1.0 min?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resistance of 1:n*:r kj5h da9vdh/fbc6) spx.0 m copper wire of diameter 0.40 inch? (The resistivity of copbrjdh spv:*:569 xd/cn)afkh per is $1.68 \times 10^{-8} \; \Omega \cdot m$.)

参考答案:    
标记此题
44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resistance of a c):7 3ltg-rrk r:mh/sk)lmhh k ircular rod 1.0 cm in diameter and 45 m long, if the resis gtk 7rhl r3:k m-:hm/h)kl)rstivity is $1.4 \times 10^{-8} \; \Omega \cdot m$?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What length of copper wire (resistivityih*, 46m l0twkj u-9r rke/ecf $1.68 \times 10^{-8} \; \Omega \cdot m$) of diameter 0.15 mm is needed for a total resistance of $15 \; \Omega$?

参考答案:    
标记此题
46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 120-m long copper wire (resistivity 6qfdx.sao2f4 3- zgyu$1.68 \times 10^{-8} \; \Omega \cdot m$) has resistance $6.0 \; \Omega$. What is the diameter of the wire?

参考答案:    
标记此题
47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.5-cm square rod, 4.0 m long, measures 0.040 ohje 8kqv)jfi7-x)4qr a ms. What is its resistivity?

参考答案:    
标记此题
48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the current through a 10.0-m long 22 gauge (the radius is 0.321 6fg-jmhpwy 5gi6i;sk 7deu8:mm) nichromsum7j fpw 6ikh: 8gyg65-;i ede wire if it is connected to a 12.0-V battery. (The resistivity of nichrome is $100 \times 10^{-8} \; \Omega \cdot m$.)

参考答案:    
标记此题
49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A heavy bus bar is 20 cm long and of rectangular cross-section, vcyu0c k10a7y1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistivity of coykc7c uv0a 1y0pper is $1.68 \times 10^{-8} \Omega \cdot m$)

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resids5dpz *sh o3navk n msy*9zhh50+1f (stivity of $100 \times 10^{-8} \; \Omega \cdot m$. If the wire carries a current of 0.50 A, what is the voltage across the wire?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-mm diameter copp6gtivzc k0 4yv4)p;qwer wire (resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) carries a current of 15 A. What is the potential difference between two points 100 m apart?

参考答案:    
标记此题
52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A carbon resistor has a resistance olb km1+wh).g*bql w:cf $18 \Omega$ at a temperature of $20 ^{\circ}C$. What is its resistance at a temperature of $120 ^{\circ}C$? (The temperature coefficient of resistivity for carbon is $-5.0 \times 10^{-4} /^{\circ}C$.)

参考答案:    
标记此题
53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The temperature coeffj7x2z: :8onstir f 8(n sc(o)h1qipj aicient of resistivity of platinum is $3.9 \times 10^{-3} /^{\circ}C$. If a platinum wire has a resistance of R at room temperature ($23 ^{\circ}C$), to what temperature must it be heated in order to double its resistance to 2R?

参考答案:    
标记此题
54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A platinum wire is used to determinppj ,y7:.iyxy e the melting point of indium. The resistance of, y:. y7yjipxp the platinum wire is $2.000 \; \Omega$ at $20 ^{\circ}C$ and increases to $3.072 \; \Omega$ as indium starts to melt. What is the melting point of indium? (The temperature coefficient of resistivity for platinum is $3.9 \times 10^{-3} /^{\circ}C$.)

参考答案:    
标记此题
55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.00 A is flowing through 8 y9oad; 5cl5.qn)c/gy eesttan $10.0 \; \Omega$ resistor. How much power is being dissipated?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 110-V hair dryer is rated at 1200 W. What current willtejh/ro x j6,. it draw?

参考答案:    
标记此题
57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W light bulb running on 110 V draws how much yo;pp; s*/vmia3 qi9jo7pxa-current?

参考答案:    
标记此题
58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the nominal resistance of a 100-x.6zbevb s06; p)nlie1iz i7tW light bulb designed to be used in a 120-V c;p 7) lzb.i ex0vsi1etzbn i66ircuit?

参考答案:    
标记此题
59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toaster is rated 800 W at q7ly7jbkf38xb 2 9vu a120 V. What is the resistance of its heating element?77qjvabfyu293 kl8 xb

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 200-W resistor is t.etkzo0ylu y xr8u10u7rl,n3ve uh5): zpn:rated at $1/4 \; \Omega$. What is the maximum current it can draw?

参考答案:    
标记此题
61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 200-W resistor is 5pcgnby+jon24 f)q:g rated at $1/4 \; \Omega$. What is the maximum voltage?

参考答案:    
标记此题
62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lamp uses a 150-W buld,gc94:td mvg605yky 5c nag bb. If it is used at 120 V, what current does it draw?

参考答案:    
标记此题
63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lamp uses a 150-W bulb,s/hy:p xbo*s mhv )- njuca2 ujt.--h. If it is used at 120 V, what is its resistance?

参考答案:    
标记此题
64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 25-W soldering iron runsg v 5dpywv1uo6(b,c2q*vpj n +vps+f4 on 110 V. What is its resistance?

参考答案:    
标记此题
65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much does it cost to operate a 25-W solderimx:b ;lj 3he8ekm6f. ing iron for 8.0 hours, if energy costs hfm6 j3e e;kx:li.bm8$0.08/kWh?

参考答案:    
标记此题
66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much energy does a 100-W light (wxkfnpkgg35rm f7, ,bulb use in 8.0 hours?

参考答案:    
标记此题
67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-W heater is connected toky-1k.:8cq e09ab+ yb,a hxjncy -rgi a 120-V line for 2.0 hours. How much heat energy is producbx,yybk8ec01 jk-+qiy-9a acg h .r n:ed?

参考答案:    
标记此题
68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A battery is rated at 12 V and 160 Ae8o6e hs4gltcz.2aj/w2an/2/mdm p e-h. How much energy does the battery store?ze 4n m2 2/hpl.8j g2cadete/ma6osw/

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much energy does a 25-W soldering iron; s84w(y bqyj6v9s cra use in 8.0 hours?

参考答案:    
标记此题
70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-W driveway light bulb is on 10 hours per day4d7 e3gblls eb(.zqq *. Assuming the power company charges 10 ce . bq4 gzs(bd7eqe3ll*nts for each kilowatt-hour of electricity used, estimate the annual cost to operate the bulb.

参考答案:    
标记此题
71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-W computer (computer plus monitor) is turned on 8.0 hours per day. 7gjwk bp8;z 9ht,k22b fzofr5 If electricity costs 10 cents per kWh, how much does it cost to run the comf9wbrzzj ko2;tpfb2 8 g5,k h7puter annually?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The monthly (30 days) m2zn4dm75a 8-vno-++pld h wf opb7 glelectric bill included the cost of running a central air-conditioning unit for 2.0 hr/day at 5000 W, and a series connection of ten 60 W light bulbs for 5.0 hr/day. How much did these items contribute to the cost of the monthly electric bill if electricity costs 7oab-5op4+-lmgvl7 np 82+mnfdw dz h 8.0 cents per kWh?

参考答案:    
标记此题
73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The heating element in an electric drier operates on 24vp,ko4/sabgc 9ci 7m q1yv;;7hs di9z0 V and generates heat at the rate of 2.1 kW. 7z4cb9vidyq7,m; pka v;i1soc /s9hg The heating element shorts out and, in repairing it, the owner shortens the Nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?

参考答案:    
标记此题
74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14 A of current flows thr+xs :wrl5+:i*prlym eough $8.0 \; \Omega$ resistor for 24 hours. How much does this cost if energy costs $0.09/kWh?

参考答案:    
标记此题
75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 9.0-V battery costb .m*1pryc0 xa7d.pbl3c z/fk s $1.49, and will run a portable CD player for 6.0 hours. Suppose the battery supplies a current of 25 mA to the player. What is the cost of energy in dollars per kWh?

参考答案:    
标记此题
76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motor that can do work at the rate0+ bw :uoypk 0nzlb.3c of 2.0 hp has 60% efficiency. How much current does it draw from a k3:bulzw 0p+y0 n.ocb120-V line? ($1 \; hp = 746 \; W$)

参考答案:    
标记此题
77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-W device is connected to a 120-V ac power source. What rms uweif to29- 8bcurrent flows through this du f8-t9o2wb eievice?

参考答案:    
标记此题
78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-W device is connected to a 120-V ac power source. 7p0t y 4kj95amh/eacc What peak current flows through this device?ptem k5 4a79jay cc0h/

参考答案:    
标记此题
79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-W device is connected to gzeye9()9 x13)-b khz vyyrqi, d jr6ga 120-V ac power source. What is the peak voltage across th- x)hi,kg19)erqyedrz y6 39(jzgv by is device?

参考答案:    
标记此题
80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diameter of a copper wire is 0.081 inch. The maximumx,zb9pr(a1fa m5, ( v)o tolgg safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is the drift velocity of the electrons? (The number of electron carriers in onzfta )((1r5axmg,,bo9pgvl o e cubic centimeter of copper is $8.5 \times 10^{22}$.)

参考答案:    
  • 姓名:游客(未登录)
    •
    总分:80分 及格:48分 时间:不限时
    未答题: 已答题:0 答错题:
    当前第 题，此次习题练习共有 80 道题
    本平台(https://autoconfig.51fly.win/)支持练习，作业与考试(自动评分)三种模式，群组成绩统计排序导出，题目动态变量实现同卷千人千题。
    如果您对本系统感兴趣，想加入我们或者想进行任何形式的合作，请加微信 skysky1258

    试卷内容到此结束!   © 2026 51fly国际课程 (https://51fly.win)版权所有

    浏览记录|手机版视频|手机版试卷|使用帮助|51fly国际课程 (https://51fly.win)

    GMT+8, 2026-6-11 16:13 , Processed in 0.578120 second(s), 190 queries , Redis On.