为什么同样的App在手机上比电脑更省电？
Why does the same app use less power on a phone than a PC?
手机多用ARM等低功耗、高能效的架构，并配合精细的功耗门控，单位算力耗电远低于传统的x86电脑。
Phones use low-power, efficient architectures like ARM with fine-grained power gating, giving far better energy per computation than x86 PCs.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Hennessy & Patterson,《Computer Architecture: A Quantitative Approach》第6版,Morgan Kaufmann,2017
J. L. Hennessy and D. A. Patterson, Computer Architecture, 6th ed., Morgan Kaufmann, 2017
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2664271W：Computer architecture（按
#能效 #ARM #架构
为什么滚动网页时画面有时会“撕裂”？
Why does a scrolling screen sometimes 'tear'?
当显卡输出帧率和屏幕刷新率不同步时，一帧的上半部分和另一帧的下半部分拼在一起就会撕裂，开启垂直同步可解决。
When the GPU frame rate and screen refresh are out of sync, halves of two frames combine into a tear; vertical sync (VSync) fixes it.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Hennessy & Patterson,《Computer Architecture: A Quantitative Approach》第6版,Morgan Kaufmann,2017
J. L. Hennessy and D. A. Patterson, Computer Architecture, 6th ed., Morgan Kaufmann, 2017
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2664271W：Computer architecture（按
#撕裂 #刷新率 #垂直同步
为什么手动关掉后台App不一定更省电？
Why doesn’t killing background apps always save battery?
现代系统对后台有统一调度，频繁手动杀进程反而会让它下次重启更耗电；真正省电的是限制后台刷新与定位。
Modern systems schedule background tasks; force-killing them often makes them restart and use more power. Limiting background refresh and location helps more.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
Android 官方开发者文档《Processes and app lifecycle》与《The activity lifecycle》
Android Developers documentation, "Processes and app lifecycle" and "The activity lifecycle"
#后台 #调度 #省电
为什么重启一下常常能解决很多问题？
Why does a restart often fix many problems?
重启会清空内存里出错的临时状态、重置驱动程序、结束卡死的进程，让系统回到一个干净起点。
A restart clears buggy temporary state in memory, resets drivers, and kills stuck processes, returning the system to a clean start.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Hennessy & Patterson,《Computer Architecture: A Quantitative Approach》第6版,Morgan Kaufmann,2017
J. L. Hennessy and D. A. Patterson, Computer Architecture, 6th ed., Morgan Kaufmann, 2017
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2664271W：Computer architecture（按
#重启 #排错 #内存
为什么标称128GB的手机，实际可用空间少很多？
Why is usable space far less than the stated 128 GB?
厂商按1GB=10亿字节计算，系统按2的30次方计算，再加上系统和恢复分区占用，可用空间通常少一成以上。
Vendors count 1 GB as a billion bytes while the system uses 2^30, plus system and recovery partitions, so usable space is over 10% less.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Hennessy & Patterson,《Computer Architecture: A Quantitative Approach》第6版,Morgan Kaufmann,2017
J. L. Hennessy and D. A. Patterson, Computer Architecture, 6th ed., Morgan Kaufmann, 2017
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2664271W：Computer architecture（按
#存储 #容量 #换算
为什么删除文件后空间没有马上回来？
Why doesn’t free space return immediately after deleting files?
文件可能先进回收站，云盘和SSD还需后台整理（trim），若仍有进程打开该文件，空间也会暂时不释放。
Files may go to a recycle bin, cloud drives and SSDs need background cleanup (trim), and if a process still holds the file, space stays reserved.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
《操作系统概念》（Abraham Silberschatz 等）
Operating System Concepts (Silberschatz et al.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780470577233 (2019)
#删除 #回收站 #trim
为什么拍照后要“处理”一两秒才能看？
Why does a photo need a second or two of processing?
这叫计算摄影：手机会把多张曝光合成HDR、做降噪和对齐，比单张快门复杂得多，所以需要时间。
Called computational photography, the phone merges multiple exposures for HDR, denoises, and aligns them—far more complex than one shutter press.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Hennessy & Patterson,《Computer Architecture: A Quantitative Approach》第6版,Morgan Kaufmann,2017
J. L. Hennessy and D. A. Patterson, Computer Architecture, 6th ed., Morgan Kaufmann, 2017
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2664271W：Computer architecture（按
#计算摄影 #HDR #处理
为什么下载速度总到不了宽带标称的值？
Why can’t download speed reach the advertised broadband number?
宽带标的是Mbps，实际常用MB/s，两者相差约8倍，而且受服务器、网络拥塞和协议开销限制。
Broadband is rated in Mbps while downloads show MB/s, about 8 times apart, and servers, congestion, and protocol overhead cap real speed.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Kurose & Ross,《Computer Networking: A Top-Down Approach》第8版,Pearson,2021
J. F. Kurose and K. W. Ross, Computer Networking, 8th ed., Pearson, 2021
#带宽 #下载 #Mbps
手机为什么会发热？
Why do phones get hot?
高负载时处理器和电池把电能转成热量，射频、快充和环境高温叠加，温控系统会降频来防止过热。
Under load the chip and battery turn electricity into heat; radio, fast charging, and warm environments add up, so thermal control throttles to avoid damage.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Hennessy & Patterson,《Computer Architecture: A Quantitative Approach》第6版,Morgan Kaufmann,2017
J. L. Hennessy and D. A. Patterson, Computer Architecture, 6th ed., Morgan Kaufmann, 2017
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2664271W：Computer architecture（按
#发热 #散热 #温控
为什么手机充到80%以后就变慢了？
Why does charging slow down after 80 percent?
锂电池后期改用涓流和恒压充电来保护电池，降低电流防止过充和发热，从而延长寿命。
In the later stage lithium batteries switch to trickle and constant-voltage charging to avoid overcharge and heat, protecting lifespan.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#充电 #锂电池 #保护
为什么在电梯里手机信号特别差？
Why is phone signal so poor inside elevators?
电梯金属轿厢像屏蔽罩挡住无线电波，封闭空间信号弱，手机会提高发射功率也仍难连上。
The metal cabin shields radio waves and the enclosed space has weak signal, so even raising transmit power the phone struggles to connect.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#信号 #电梯 #屏蔽
为什么浏览器开太多标签页会变卡？
Why do too many browser tabs make things slow?
每个标签页都有独立的渲染进程，占用内存和显卡资源，内存吃紧后系统频繁换页，整体就拖慢了。
Each tab runs its own rendering process using memory and GPU; when memory is tight the system swaps constantly and everything slows.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Hennessy & Patterson,《Computer Architecture: A Quantitative Approach》第6版,Morgan Kaufmann,2017
J. L. Hennessy and D. A. Patterson, Computer Architecture, 6th ed., Morgan Kaufmann, 2017
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2664271W：Computer architecture（按
#标签页 #内存 #浏览器
为什么Wi-Fi通常比网线慢而且不稳定？
Why is Wi-Fi usually slower and less stable than a cable?
无线是共享介质，容易被墙壁和电器干扰，信号随距离衰减，还要竞争时间片，所以有波动和丢包。
Wireless is a shared medium, easily disturbed by walls and appliances, weakens with distance, and competes for time slots, causing jitter and loss.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Kurose & Ross,《Computer Networking: A Top-Down Approach》第8版,Pearson,2021
J. F. Kurose and K. W. Ross, Computer Networking, 8th ed., Pearson, 2021
#Wi-Fi #无线 #延迟
为什么电脑用着用着会卡顿？
Why does a computer get slow and laggy over time?
卡顿常因为CPU太忙、内存不够触发硬盘换页、磁盘读写跟不上，或后台程序太多，也可能因发热降频保护。
Lag often comes from a busy CPU, low memory triggering disk swapping, slow storage, too many background apps, or throttling when hot.
难度 进阶 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Hennessy & Patterson,《Computer Architecture: A Quantitative Approach》第6版,Morgan Kaufmann,2017
J. L. Hennessy and D. A. Patterson, Computer Architecture, 6th ed., Morgan Kaufmann, 2017
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2664271W：Computer architecture（按
#卡顿 #性能 #CPU
为什么手机电量掉得很快？
Why does phone battery drain so fast?
屏幕亮度、弱信号下射频高功耗、后台刷新、5G和电池老化都会加速耗电，尤其在低温环境更明显。
Brightness, high radio power in weak signal, background refresh, 5G, and battery aging all accelerate drain, worse in the cold.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#耗电 #电池 #后台
为什么手机屏幕越亮就越费电？
Why does a brighter screen use more battery?
屏幕发光是手机最耗电的部分之一，更亮就要发出更多光，自然要吃掉更多电量。
Screen light is among the biggest power users; brighter means more light and more battery consumed.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#屏幕 #亮度 #耗电