{"resolved":true,"match_type":"uuid","source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","requested_by":"printed_page","book":{"source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","id":"38270854-596f-4a26-8183-db8c968c6020","uuid":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","normalized_title":"编码隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","isbns":["9787121181184","0123456789","6044921875","3039331000","0000000000","0000000000000"],"parsed":true,"ai_readable":true,"document_type":"book","page_count":438,"navigation_url":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020","title_url":"https://workshop.closeclaw.top/ai/title/%E7%BC%96%E7%A0%81%20%E9%9A%90%E5%8C%BF%E5%9C%A8%E8%AE%A1%E7%AE%97%E6%9C%BA%E8%BD%AF%E7%A1%AC%E4%BB%B6%E8%83%8C%E5%90%8E%E7%9A%84%E8%AF%AD%E8%A8%80","fixed_page_url_template":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","path_api_url_template":"https://workshop.closeclaw.top/api/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","read_url":"https://workshop.closeclaw.top/api/ai/read/38270854-596f-4a26-8183-db8c968c6020","page_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/page","search_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/search"},"page":{"printed_page":31,"pdf_page":47,"physical_index":47,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"b5a5bd3a87d2e6d26e13a0f065ba4a634b87b9e5f7c090e3dac8c035b8ab5928"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"你家里或许在使用100瓦的灯泡。它们被设计成能在120伏的电压下工作。因此，流经它们的电流的大小等于100瓦除以120伏，也就是0.83安。所以100瓦灯泡的电阻是120伏除以0.83安，即144欧姆。\n\n好了，现在我们貌似已经把手电筒里里外外都分析了一遍一电池，导线还有灯泡。但是，我们还忘记了最重要的一部分！\n\n是的，那就是开关。开关控制电路中电流是否接通。当开关被设置成允许电流通过时，我们称它的状态为“开”，或者“闭合”。当处在“关”或者“断开”状态时，开关不允许电流通过。（“闭合”和“断开”这两个词，在用来描述开关时，其含义与用来描述房门时恰好是相反的。一扇闭合的门会阻止所有试图穿过它的东西；一个闭合的开关却可以使电流导通。)\n\n开关只能是闭合状态或断开状态。电流只能是有或者无。灯泡也只能是发光或不发光。就像莫尔斯和布莱叶发明的二进制码一样，这个简单的手电筒要么是开着的，要么是关着的。没有介于二者之间的状态。在后面的章节中，二进制码与电气电路之间的这种相似性将起到很大作用。\n\n4 手电筒的剖析\n\n31","previous_page":30,"next_page":null}