& 电功率的测量知识点 & “某班同学分组运用如图（a）所示的实验器材...”习题详情
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某班同学分组运用如图（a）所示的实验器材做测小灯泡功率的实验，其中小灯泡标有“3.8V”的字样、灯丝电阻约为10Ω左右．请完成或回答以下两组问题．（1）补画导线，把图（a）中的器材连接成实验电路，要求导线不交叉，且滑动变阻器的滑片P&向右滑动时灯泡变亮；（2）在连接电路前，应先将开关断开&，电路连好后闭合开关，发现小灯泡两端电压为2.5V，这时小灯泡的亮度较暗，为使小灯泡正常发光，应将滑片P应向B&（选填“A”或“B”）端移动；（3）小灯泡正常发光时，电流表的指示如图（b），读出电流表示数为0.34&A，则小灯泡额定功率为1.292&W；（4）某同学的实验记录和有关计算如下表所示：
实验序号&电压（V）&电流（A）&电功率（W）&额定功率（W）&1&3.0&0.25&0.75&1.07&2&3.8&0.3&1.14&3&4.1&0.32&1.31&从表格设计和有关数据看，该同学把三次测量的电功率求出的平均值当成了小灯泡的额定功率，他认为这样可以减小误差，你认为该同学的做法是错误&的（选填“正确”或“错误”）．（5）若实验器材中电压表0～15V的量程不灵，而0～3V的量程正常，电源电压恒为6V，请在图（c）方框中画出能测定小灯泡额定功率的实验电路图．
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题型：填空题&|&来源：网络
分析与解答
习题“某班同学分组运用如图（a）所示的实验器材做测小灯泡功率的实验，其中小灯泡标有“3.8V”的字样、灯丝电阻约为10Ω左右．请完成或回答以下两组问题．（1）补画导线，把图（a）中的器材连接成实验电路，要求导线不交叉...”的分析与解答如下所示：
（1）将电压表与灯泡并联，根据灯泡的额定电压确定电压表的量程；滑动变阻器串联在电路中，滑动变阻器的滑片P向右滑动时灯泡变亮，此时滑动变阻器的阻值应变小；（2）在连接电路前，应将开关断开；若灯泡两端的电压低于额定电压，则灯泡发光较暗；为使灯泡正常发光，此时应减小滑动变阻器的阻值，使灯泡两端的电压等于其额定电压；（3）跟b图读出电流表的示数，根据P=UI计算出电功率；（4）灯泡在不同电压下的电功率不同，额定功率是指额定电压时的功率；（5）灯泡正常发光时，滑动变阻器两端电压为6V-3.8V=2.2V＜3V，电压表0～15V的量程损坏，0～3V的量程正常，可以把电压表与滑动变阻器并联，进行实验．
解：（1）灯泡额定电压是3.8V，电压表应选0～15V量程，灯泡与滑动变阻器串联接入电路，电压表与灯泡并联，电路图如图所示：（2）连接电路前，开关应断开；由电路图可知，当滑片P向右或B端移动时，滑动变阻器接入电路的阻值减小，灯泡两端电压变大，当电压表示数为灯泡额定电压，灯泡正常发光．（3）由图（b）可知，电流表量程是0～0.6A，分度值是0.02A，电流表示数是0.34A，灯泡额定功率是P=UI=3.8V×0.34A=1.292W．（4）灯泡的功率与实际电压有关，额定功率是指灯泡两端等于额定电压时的电功率，而不是所测电功率的平均值；（5）电压表0～15V的量程损坏，0～3V的量程正常滑动变阻器，可以把电压表与滑动变阻器并联，测滑动变阻器两端电压，当电压表示数为6V-3.8V=2.2V时，灯泡两端电压等于其额定电压，灯泡正常发光，电路如图所示：．故答案为：（1）见上图；（2）断开；B；（3）0.34；1.292；（4）错误；（6）见上图．
本题考查了连接电路图、实验的注意事项、滑动变阻器的调节、电表读数、求灯泡功率、求电阻、电路设计等问题，是一道电学实验综合题，是常考题型，一定要掌握．对电表读数时，一定要先确定量程与分度值，然后再读数，读数时，视线要与电表刻度线垂直．
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某班同学分组运用如图（a）所示的实验器材做测小灯泡功率的实验，其中小灯泡标有“3.8V”的字样、灯丝电阻约为10Ω左右．请完成或回答以下两组问题．（1）补画导线，把图（a）中的器材连接成实验电路，要求...
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经过分析，习题“某班同学分组运用如图（a）所示的实验器材做测小灯泡功率的实验，其中小灯泡标有“3.8V”的字样、灯丝电阻约为10Ω左右．请完成或回答以下两组问题．（1）补画导线，把图（a）中的器材连接成实验电路，要求导线不交叉...”主要考察你对“电功率的测量”
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电功率的测量
【知识点的认识】（1）．（2）．【解题方法点拨】（1）．（2）．【命题方向】．
与“某班同学分组运用如图（a）所示的实验器材做测小灯泡功率的实验，其中小灯泡标有“3.8V”的字样、灯丝电阻约为10Ω左右．请完成或回答以下两组问题．（1）补画导线，把图（a）中的器材连接成实验电路，要求导线不交叉...”相似的题目：
赵新同学在做“测定小灯泡额定功率”的实验中，所用电源电压为&6V，变阻器上标有“20欧2A”字样，灯泡的额定电压为3.8V，他按图甲所示电路进行实验．&（1）实验原理是&&&&他在检查仪器时，发现电流表指针如图乙所示，则接下来的操作是&&&&．（2）按电路图正确连接电路后，闭合开关前需要把变阻器的滑片放在&&&&的位置上．&（3）实验时，他调节变阻器的滑片，观察到的现象如图丙所示．则产生该现象的原因是：&&&&以及&&&&．（4）赵新同学经过思考、分析后，重新做实验，使小灯泡正常发光，此时变阻器滑片位置正好在中点上，则小灯泡的额定功率为&&&&W．&&&&
小明和小红二位同学各自进行“测定小灯泡电功率”的实验．实验中使用的小灯均标有“3.8V”字样，所用电源和滑动变阻器相同．（1）明按图（a）正确连接电路，并将变阻器的滑片移至最右端．闭合电键后，三个&电表的示数如图（b）、（c）、（d）所示，则他们所用的电源电压为&&&&伏．接着他移动变阻器的滑片，当小灯正常发光时，观察到变阻器的滑片恰好在中点上（即它接入电路的电阻为最大阻值的一半），小灯的额定功率为&&&&瓦．（2）正确连接电路后，小红闭合电键，电路正常工作．一段时间后，三个电表中只有一个电表的示数变大．若电路中只有一处故障，且只发生在小灯L或变阻器R上，则示数变大的电表可能是&&&&（选填“A”、“V1”或“V2”），此时电路中存在的故障可能是&&&&．
小王做“测量小灯泡电功率”的实验所用器材有：标有“2.5V”字样、正常发光时阻值约为13Ω的完全相同的小灯泡两个，电压恒为3V的学生电源，标有“20Ω，1A”的滑动变阻器，电流表，电压表，开关及导线若干．（l）图甲是实验电路图，图乙是实物连接图，接线过程中有一处连接错误，请在错误的接线上打“&”并用笔画线代替导线进行改正，要求改正后滑动变阻器接入电路的阻值最大．（2）小王在实验之前检查仪表时发现：电流表有电流通过时能自由偏转；电流表未接入电路时，电流表指针如图丙所示，出现这种现象的原因是&&&&．（3）按电路图正确连接后，闭合开关，灯不亮，电压表示数接近电源电压，电流表无示数造成这种现象的原因可能是&&&&（填正确选项前的字母）A．滑动变阻器断路&&&&&&&&&&B．开关接触不良C．小灯泡与灯座接触不良&&&&D．电流表断路（4）排除故障后，闭合开关，改变滑动变阻器滑片位置，将电压表和电流表的示数填人右表中．从表中可知小灯泡的额定功率为&&&&W．（5）若将两个小灯泡串联后直接接在3V电源的两端，两灯消耗的总电功率为&&&&W．电压表的示数U/V电流表的示数I/A小灯泡的功率P/W1.50.162.50.202.80.22&&&&
“某班同学分组运用如图（a）所示的实验器材...”的最新评论
该知识点好题
1（2013o无锡）某同学用图甲所示的电路图测量小灯泡的额定电功率（小灯泡标有“2.5V”字样）．（1）电路连接正确后，闭合开关，发现小灯泡不亮，但电流表有示数，接下来应进行的操作是&&&&（填序号）．①更换小灯泡；②检查电路是否断路；③移动滑动变阻器滑片．（2）实验过程中，移动滑动变阻器滑片，当电压表示数为2.5V时，电流表的示数如图乙所示，其值为&&&&A，小灯泡的额定功率为&&&&W．
2小明利用如图甲所示电路测定小灯泡的功率．被测小灯泡的额定电压为2.5V，电阻约为10Ω左右．实验室有如下器材：电源（电压为6V）、电流表（0～0.6A&&0～3A）、电压表（0～3V&0～15V）、开关各一个、导线若干、滑动变阻器三只：R1（20Ω&0.5A）、R2（50Ω&0.5A）、R3（500Ω&1A）．（1）实验前在检查仪器时，发现电流表指针如图乙所示，则接下来的操作是&&&&．正确连接电路闭合开关后，发现无论怎样移动滑动变阻器滑片，灯泡都不亮，电压表示数接近6V，电流表示数几乎为0，电路的故障可能是&&&&．（2）排除电路故障后，闭合开关，改变滑动变阻器的阻值，多次测量，小明画出了小灯泡中电流随其两端电压变化的关系图象（如图丙），则小灯泡的额定功率为&&&&W．在多次测量中，小明还发现：当电压表的示数增大时，电压表与电流表的示数之比&&&&．（选填“变大”、“变小”或“不变”）．（3）小明又取了一个规格、型号完全相同的旧灯泡进行实验，发现在额定电压下工作时，灯泡亮度明显偏暗，小明仔细观察，发现这只灯泡的玻璃内壁变黑．灯泡亮度偏暗的原因是灯丝发光时发生&&&&（选填物态变化名称）而变细，消耗的实际功率变&&&&的缘故（选填“大、小）．（4）灯泡的功率测量完毕，小明用5Ω、10Ω、15Ω、20Ω、25Ω的定值电阻更换电路中的灯泡，探究电流跟电阻的关系，得到如图丁所示的电流I随电阻R变化的图象，则小明应选用滑动变阻器&&&&（选填“R1”、“R2”或“R3”）．若某次实验中滑动变阻器连入的阻值为14Ω，则所选定值电阻的阻值为&&&&．
3如图甲是测量标有“3.8V”字样的小灯泡额定功率的电路图．（1）连接电路时，开关应处于&&&&状态，滑动变阻器的滑片应移到最&&&&端．（2）当电压表示数为3.8V时，电流表的示数如图乙所示，是&&&&A，由此可得，小灯泡的额定功率为&&&&W．（3）在实验中，小明把电流表与电压表的位置互换，闭合开关后造成&&&&（选填选项前的字母）．A．电流表被烧坏 B．电压表被烧坏C．小灯泡被烧坏 D．小灯泡不亮（4）小强的电流表损坏了，老师告诉他已经没有电流表可换了，而给了他一个已知阻值为R的定值电阻和若干个开关，小强重新设计了如图丙所示的电路，在不改变该电路连接的情况下，也能正确测出小灯泡的额定功率．正确连接电路后，接下来的实验步骤是：①&&&&；②保持滑片位置不动，断开开关S1，闭合开关S、S2，记下电压表的示数U2；③得出小灯泡额定功率的表达式P=&&&&．
该知识点易错题
1某物理兴趣小组在做“测量小灯泡的电功率”实验时，选取的电源为三节新干电池，使用的小灯泡额定电压为2.5伏．（1）电路连接完成后，闭合开关，他们发现小灯泡不亮，电压表没有示数，电流表指针有明显的偏转，他们分析电路故障原因可能是&&&&A．小灯泡断路&&&&&&&&&&&B．小灯泡短路&&&&&&&&&&C．滑动变阻器断路（2）故障排除后重新闭合开关，移动滑动变阻器滑片P到某一位置时，电压表的示数如图乙所示，此时小灯泡两端电压为&&&&V；（3）在（2）的基础上，若要使小灯泡正常发光，他们应将图甲中滑片P向&&&&（选填“A”或“B”）端移动；（4）他们移动滑片P，记下多组对应的电压表和电流表的示数，并绘制成图丙所示的图象，根据图象信息，可知小灯泡的额定功率是&&&&W；（5）一位小组成员将图甲中的小灯泡更换成定值电阻，电路其他部分不改变，他还可以完成的探究实验是&&&&A．探究电流的磁场强弱与电流大小的关系&&&&&&&&&&B．探究电流与电压的关系C．探究电流产生的热量与电阻的关系．
2小亮同学做测定“小灯泡的额定电功率”实验时所用器材有电压为6V的电源、额定电压为2.5V的小灯泡（小灯泡的额定功率小于1W）、滑动变阻器（50Ω1A）、以及符合实验要求的电表、开关和导线．如图（甲）是小亮同学没有连接完整的电路．（1）本实验的实验原理是&&&&（2）请你用笔画线代替导线，将图（甲）所示的电路连接完整．（3）小亮同学连好电路后闭合开关，移动滑动变阻器滑片P，发现小灯泡始终不亮，电压表有示数，电流表无示数，则故障可能是&&&&（写出一种即可）．（4）小亮同学排除故障后闭合开关，移动滑动变阻器滑片P，同时，眼睛应注视&&&&（选填序号）．A．小灯泡亮度&&&&&&&&&&&B．电压表示数C．电流表示数&&&&&&&&&&&D．滑动变阻器滑片（5）小亮同学移动滑动变阻器滑片P到某处时，电压表的示数为2.2V，要测量小灯泡的额定功率时，应将滑片P向&&&&端移动（选填“A”或“B“）．当小灯泡正常发光时，电流表示数如图（乙）所示，则小灯泡的额定功率是&&&&W，此时小灯泡的电阻是&&&&Ω．该实验中滑动变阻器除了保护电路外，还有&&&&的作用．（6）小亮利用该电路探究电流跟电阻的关系，他将小灯泡换成多个定值电阻R，保持电压表示数始终为如图（丙）所示，多次更换阻值不同的定值电阻R，并记录各次电流表的示数，若不更换其他器材，为了能够完成实验，更换的电阻阻值不能够大于&&&&Ω．
3（2012o武汉模拟）某同学利用图甲所示的电路测量小灯泡的电功率．电路中电源电压保持4.5V不变，灯泡上标有“3V，1W”字样．闭合开关，将滑片P滑到某一位置时，电压表的指针指示的位置如图乙所示．下列说法错误的是（　　）
欢迎来到乐乐题库，查看习题“某班同学分组运用如图（a）所示的实验器材做测小灯泡功率的实验，其中小灯泡标有“3.8V”的字样、灯丝电阻约为10Ω左右．请完成或回答以下两组问题．（1）补画导线，把图（a）中的器材连接成实验电路，要求导线不交叉，且滑动变阻器的滑片P向右滑动时灯泡变亮；（2）在连接电路前，应先将开关____，电路连好后闭合开关，发现小灯泡两端电压为2.5V，这时小灯泡的亮度较暗，为使小灯泡正常发光，应将滑片P应向____（选填“A”或“B”）端移动；（3）小灯泡正常发光时，电流表的指示如图（b），读出电流表示数为____A，则小灯泡额定功率为____W；（4）某同学的实验记录和有关计算如下表所示：
{[实验序号][电压（V）][电流（A）][电功率（W）][额定功率（W）][1][3.0][0.25][0.75][1.07][2][3.8][0.3][1.14][3][4.1][0.32][1.31]}从表格设计和有关数据看，该同学把三次测量的电功率求出的平均值当成了小灯泡的额定功率，他认为这样可以减小误差，你认为该同学的做法是____的（选填“正确”或“错误”）．（5）若实验器材中电压表0～15V的量程不灵，而0～3V的量程正常，电源电压恒为6V，请在图（c）方框中画出能测定小灯泡额定功率的实验电路图．”的答案、考点梳理，并查找与习题“某班同学分组运用如图（a）所示的实验器材做测小灯泡功率的实验，其中小灯泡标有“3.8V”的字样、灯丝电阻约为10Ω左右．请完成或回答以下两组问题．（1）补画导线，把图（a）中的器材连接成实验电路，要求导线不交叉，且滑动变阻器的滑片P向右滑动时灯泡变亮；（2）在连接电路前，应先将开关____，电路连好后闭合开关，发现小灯泡两端电压为2.5V，这时小灯泡的亮度较暗，为使小灯泡正常发光，应将滑片P应向____（选填“A”或“B”）端移动；（3）小灯泡正常发光时，电流表的指示如图（b），读出电流表示数为____A，则小灯泡额定功率为____W；（4）某同学的实验记录和有关计算如下表所示：
{[实验序号][电压（V）][电流（A）][电功率（W）][额定功率（W）][1][3.0][0.25][0.75][1.07][2][3.8][0.3][1.14][3][4.1][0.32][1.31]}从表格设计和有关数据看，该同学把三次测量的电功率求出的平均值当成了小灯泡的额定功率，他认为这样可以减小误差，你认为该同学的做法是____的（选填“正确”或“错误”）．（5）若实验器材中电压表0～15V的量程不灵，而0～3V的量程正常，电源电压恒为6V，请在图（c）方框中画出能测定小灯泡额定功率的实验电路图．”相似的习题。From Wikipedia, the free encyclopedia
The iPad 2 is a
designed, developed and marketed by
Compared to the first iPad, as the second model in the
line it gained a faster
, a lighter build structure, and was the first iPad to feature VGA front-facing and
rear-facing cameras designed for
video calling.
The device was available initially with three storage sizes, 16, 32 and 64 GB and two varying connectivity options,
only or Wi-Fi and cellular. Each variation of the device is available with either a black or white front glass panel. However, upon the release of the
in March 2012, only the 16 GB variation with two connectivity options and two front color options remained available.
The product became available in March through May 2011.
The device received mixed to positive reception from various blogs and publications. Although it was praised for its hardware improvement, such as the new
chip, the software restriction on the iPad 2 and
in general drew criticism from various technology commentators. The device sold well in its first month of sales with 2.4–2.6 million units sold and 11.12 million units were sold in the third quarter of 2011.
A popular product, with a lower screen resolution and performance than the two
models that followed it but a lighter build and longer battery life, it remained in the Apple line-up as an entry-level iPad model for three years until March 2014, latterly with a silent upgrade to a
version of the A5 processor. Its basic design formed the core of the , which had the same screen pixel count and similar features at a smaller size. The iPad 2 has been able to run six major versions of , from 4 to 9, the only iOS device to be able to do so. The
is a close second with support from
to , as well as the iPhone 5, which was supported from
The iPad 2 was announced at the
on March 2, 2011.
Apple sent invitations to journalists on February 23, 2011, for a media event on March 2. On March 2, 2011, CEO
unveiled the device at the , despite being on medical leave. Upon the announcement of the iPad 2, the original iPad was discontinued from sales online and at Apple authorized retail stores.
Apple began selling the iPad 2 on its website on March 11, and in its U.S. retail stores at 5 pm local time on that date. Many stores in major cities, such as New York, sold out within hours. Online shipping delays had increased to three to four weeks on Sunday and four to five weeks by Tuesday.
The iPad 2 was released internationally in 25 other countries on March 25, 2011. The countries included Australia, Austria, Belgium, Canada, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Italy, Ireland, Hungary, Luxembourg, Mexico, Netherlands, New Zealand, Norway, Poland, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
The April 29, 2011 release date for Japan was postponed due to the
which struck the nation on March 11, 2011. The iPads were delayed due to the NAND flash storage chip used in the iPads being created by , which was affected by the earthquake and tsunami thus resulting in the suspension of operations for an indefinite period of time. The slowdown caused analysts to downgrade Apple's stock.
The iPad 2 was later released in Hong Kong, South Korea, Singapore, Philippines, Malaysia and other countries including Japan on April 29, 2011. It was then released in numerous other nations which include China, Estonia, Thailand, Brazil, Russia and Taiwan on two major release dates, May 6 and 27.
The 32 and 64 GB models were discontinued on March 7, 2012, upon the introduction of the third generation iPad. The 16 GB Wi-Fi and 16 GB Wi-Fi + 3G models were discontinued on March 18, 2014.
In late March 2011, the iPad 2 was released alongside iOS 4.3, which primarily introduced Airplay Mirroring and Home Sharing among other features. On October 12, 2011, upon the release of the , the iPad was upgradable to the iOS 5 firmware which brought over 200 new user features to iOS compatible devices including Notification Center, iMessage, Reminders, and an updated notifications system, using a new "banner" style instead of the previously used pop-up "alert" style.
The iPad 2 comes with several applications by default, including , Mail, Photos, Video, Music, iTunes (store), Maps, Notes, Calendar, , and Contacts. The
is also available as a default application, it enables users to download from a database of 800,000 applications, the price of these applications is set by the developers. Like all
devices, the iPad 2 can sync music, videos, apps and photos with a Mac or PC using iTunes, although when using iOS 5 and later, the user does not have to connect the iPad to the computer.
also allows users to backup and sync their data with other compatible iOS devices via the internet. Game Center is available as a native social gaming platform on iOS, games downloaded via the App Store that have this feature enabled are able to integrate their achievement points, high-scores and bonus system across all iOS devices into a single accumulative points and social platform. Although the tablet is not designed to make phone calls over a cellular network, a user can use a wired headset or the built-in speaker and microphone and place phone calls over Wi-Fi or cellular using a
application.
The iPad 2 also adds the ability to run , , and the iWork apps , , and . These applications do not come with the iPad but are instead official applications from Apple sold within the App Store. On March 7, 2012, after the unveiling of the third generation iPad, the firmware of the iPad 2 was upgradable to iOS 5.1. Scott Rohde, a senior Sony executive described the iPad as "a
disguised as a
that can be appropriated in the business workplace."
On September 19, 2012, almost a week after the announcement of the , iOS 6 was released for numerous iOS devices, including the iPad 2. However, on iOS 6, not all features are available on the iPad 2. The software upgrade was downloadable as an over the air (OTA) update package and contains two-hundred new features, including a mapping software designed by Apple dubbed , a "Clock" app, which features a timer, stopwatch and alarm, and
integration among other new features and tweaks.
The iPad 2 is compatible with , which was released on September 18, 2013. However, some features are not available. For example, like the iPhone 4, the Notification Center and the Control Center use the transparent style instead of the translucent style in later iOS models.
The iPad 2 can run , which was released on September 17, 2014, making it the first iOS device to run five major versions of iOS (including iOS 4, 5, 6, 7, and 8). While the OS runs on the device, most of its new features do not work because of relatively aged hardware and therefore, its performance is limited. Users have also reported numerous problems after receiving the update including the accessibility features and battery-related issues. Many users predicted that the iPad 2 was going to be dropped from updating to iOS 8 along with the iPhone 4, the same process that happened with the iPhone 3GS and the iPod Touch (fourth generation) and earlier models, considering that the model was than 3 years old.
It was confirmed on June 8, 2015, at Apple's
that the iPad 2 would run . This makes the iPad 2 the first iPad and only iOS device to run six major versions of iOS. As with previous releases, though, many headline features are unavailable on the iPad 2, including predictive , translucency effects, split-view, slide-over and
and the Health app. iOS 9 is said to feature performance improvements that may help the aging device function more smoothly, and initial tests suggest that it did not significantly impact available space. Other A5-based devices will also run iOS 9 including the iPhone 4S (five major iOS versions), the iPad Mini (four major iOS versions) and
(four major iOS versions).
On June 13, 2016, with the release of , Apple dropped continuing compatibility with the iPad 2 because of its hardware limitations. The same goes with the
and , making iOS 9 the final version that will run on the device.
In July 2017 the critical WiFi vulnerability BroadPwn affecting many iOS devices, including the iPad 2 was published. It allows an attacker to remotely take control of all affected devices within WiFi range without any user interaction. Since
is in its end of life the iPad 2 won't receive a security patch for this vulnerability, making it dangerous to use them further.
In January 2018, Apple suddenly started firmware signing for iOS 6.1.3 on the iPad 2 and iPhone 4S, allowing users to downgrade these devices to iOS 6. As of February 2018, this is still supported.
Apple A5 chip used in the iPad 2
The iPad 2 features an
package-on-package (PoP)
(SoC), which comprises a 1 GHz
32-bit Cortex-A9 , 512 MB of
and a dual-core
. Other features include front and rear cameras, a three-axis , headset controls,
and ambient light sensors, , ,
and a 9.7 inch multi-touch screen with a maximum resolution of
hence resulting in 132 . The iPad 2 has four physical switches, including a home button near the display that returns the user to the home screen, and three plastic physical switches on the sides: wake/sleep, volume up/down, and a third switch for either screen rotation lock or mute. The home button on the iPad 2 is "easier to double tap" than the previous generation of the iPad. Apple reduced the size of the iPad by eliminating the stamped sheet metal frame from the display, integrating new thinner glass technology for the touch screen overlay, and slightly reducing the space between the display and battery. The iPad 2's screen is thinner, lighter, and yet stronger than the original iPad's. The iPad 2 also supports screen mirroring via the digital AV adapter and through AirPlay as of iOS 5.
The iPad 2 has a 25 
that lasts 10 hours, like the original iPad. It is charged via USB or included 10 W, 2
power adapter. The battery is 2.5 mm thick, 59% smaller than the original and has three cells instead of two. The improvements allowed the injection-molded plastic support frame to be omitted. The 10 W USB power adapter provides 4x the power of a conventional USB port. The tablet has an audio
to 20 kHz. Without third-party software it can play the following audio formats: HE-AAC, AAC, Protected AAC, MP3, MP3 VBR, Audible formats (2, 3, 4, AEA, AAX, and AAX+), , AIFF, and WAV.
The revised tablet adds front- and rear-facing cameras, which allow
video calls with other iPad 2s, the third generation iPad,
and , fourth-generation
computers (running
10.6.6 or later with a webcam). The 0.3
front camera shoots -quality 30
video and VGA-quality still photos. The 0.7 MP back camera can shoot
HD video at 30 frame/s and has a 5× times . Both shoot photo in a
fullscreen aspect ratio. The rear camera shoots video in 16:9 widescreen to match the 720p standard, although only the central 4:3 part of the recording is shown on the screen during recording. The forward-facing camera shoots in 4:3.
The Apple A5 chip doubles processing speed and has graphics processing that is up to nine times faster than the previous iPad. However, benchtests and hardware assessments performed by various third party news sources and technology blogs indicate that those cl the benchmark assessment conducted by
showed that the GPU of the iPad 2 is only 3 times faster than that of the original iPad. CPU benchmarks conducted on the iPad 2 by iOSnoops indicate a 66% performance increase compared to the original iPad.
3G versions of the iPad 2 offer
support for customers using the device on a CDMA network or / support for customers using the device on a GSM/UMTS network. The iPad Wi-Fi + 3G model includes an
receiver for tracking the user's location given permission. Also, the iPad 2 3G model includes a plastic cap-like band at the top on the back for the 3G antenna. The metallic grille for the microphone is replaced with a matching plastic black grille on the 3G model. GSM models of iPad 2 use a
card while CDMA models use an
to connect to the cellular network.
The device is 15% lighter and 33% thinner than the original iP it is thinner than the
by 0.5 mm. The
version is 1.33 lb (600 g). Both the
versions (known respectively as the
versions in the US) differ in weight slightly due to the mass difference between the GSM and CDMA cellular radios, with the GSM model at 1.35 lb (612 g) and the CDMA model at 1.34 lb (608 g). The size of the iPad 2 is also less than the original
at only 9.50×7.31×0.34 in (241.2×185.7×8.8 mm), compared to the original iPad's size at 9.56×7.47×0.5 in (242.8×189.7×13.4 mm).
After the announcement and release of the third generation iPad, the iPad 2, which continued to be available for purchase, received a hardware upgrade. The upgraded variant of the iPad 2 features a smaller version of the Apple A5 , which is able to reduce battery consumption. Benchmark tests conducted by
concluded that the upgraded variant is able to last longer by at least an hour and a half, depending on the task that is conducted on the device. The maximum temperature that the device heated up to was also less than original iPad 2, tests conducted by the same organisation revealed that the upgraded variant was able to operate at 1 degree lower when performing intensive tasks. Performance difference between the two variants, according to Anandtech is negligible.
The , first introduced with the iPad 2, is a screen protector that magnetically attaches to the face of the iPad. The cover has three folds which allow it to convert into a stand, which is also held together by magnets. While original iPad owners could purchase a black case that included a similarly folding cover, the Smart Cover is meant to be more minimal, easily detachable, and protects only the screen. Smart Covers have a
bottom that cleans the front of the iPad, and wakes up the iPad when the cover is removed. There are five different colors of both polyurethane and leather, with leather being more expensive than the polyurethane version.
Apple offers several more accessories for the iPad 2, most of which are adapters for the proprietary 30-pin , the iPad's only port besides the headphone jack. A dock holds the iPad upright at an angle, and has a dock connector and audio line out port. The iPad can use Bluetooth keyboards that also work with
and . The iPad can be charged by a standalone power adapter ("wall charger") also used for iPods and iPhones, and a 10 W charger is included with the iPad.
The iPad 2 received mixed to positive reviews, praising its Apple A5 processor and 720p camera.
said that "for those of you who haven't yet made the leap, feel free to take a deep breath and dive in – the iPad 2 is as good as it gets right now. And it's really quite good."
said the following:
"Though the iPad 2 is an improvement on the original iPad in numerous ways, it’s still an evolutionary product, not a revolutionary one. If you’re happy with your current iPad, there’s no reason to dump it just because there’s a shinier, newer one. (This is not to say that millions of people won’t do just that. I mean: shiny!) If you’ve invested in iPad accessories such as a dock or case, keep in mind that you probably won’t be able to use them with the new iPad."
's MG Siegler stated: "Let me sum all of this up in a simple way: the iPad 2, should you buy one? Maybe — it depends on a few factors. Will you want to buy one? Yes. Use that information wisely."
The closed and proprietary nature of iOS has garnered criticism, particularly by
advocates such as the , computer engineer and activist , Internet-law specialist , and the
who protested the iPad's introductory event and have targeted the iPad with their "" campaign. Competitor , via a PR spokesman, has also criticized Apple's control over its platform.
At issue are restrictions imposed by the design of iOS, namely
intended to lock purchased media to Apple's platform, the development model (requiring a yearly subscription to distribute apps developed for the iOS), the centralized approval process for apps, as well as Apple's general control and lockdown of the platform itself. Particularly at issue is the ability for Apple to remotely disable or delete apps at will. Some in the tech community have expressed concern that the locked-down iOS represents a growing trend in Apple's approach to computing, particularly Apple's shift away from machines that hobbyists can "tinker with" and note the potential for such restrictions to stifle software innovation.
Some iPad 2 users reported performance issues when running . Apple improved performance on the iPad 2 and the
on the iOS 8.1.1 update. However, those 2 devices still don't run as fast as the later models.
During the first weekend of sale, more than one million units were sold. Soon after the first weekend, Ashok Kumar, a technology analyst for a financial firm predicted that Apple would sell 35 million iPad 2s in 2011. Investment banking firm,
monitored the initial sales of the iPad 2 and reported that 70% of all iPad 2 sales were to first-time iPad buyers with 49% of buyers owning a PC compared to the initial buyers of the original iPad where only 26% of buyers owned a PC. 12,000 units were sold on auction site
in its first two weeks of release. When the iPhone 4S was released, rumors about the third generation iPad caused a decline in iPad 2 sales. Official figures released in the fourth quarter of 2011 indicate that Apple sold 11.4 million iPads in the third quarter, a 166% increase from the third quarter of 2010. The product helped create newer, larger markets for Apple in south east Asia.
In 2011 two iPad 2 tablets were taken to the
after being approved. Other Apple products that were taken to ISS include the
and also two
phones. The other personal computing system aboard ISS were various versions of the
laptop (IBM, later Lenovo brand).
Some of the applications the iPads were used for include Angry Birds game and the ISS FIT (International Space Station Food Intake Tracker) for tracking astronauts food consumption.
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