{"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":112,"pdf_page":128,"physical_index":128,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"3e014dfcc22799ecafd3c44c6619184b3f7c3dc3fec0eff4f1afb9f9ceded628"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"前面提到过，继电器对于电报系统的工作而言是至关重要的。在长距离情况下，连接电报站的电线具有很高的电阻。这就需要采取一些措施来接收微弱信号并把它增强后再发射出去。继电器就是通过电磁铁控制开关来实现这一目的的。实际上，继电器是通过放大微弱信号来生成强信号的。\n\n就我们的目的而言，我们对于继电器放大微弱信号的功能并不感兴趣。我们真正感兴趣的是继电器可以作为一个电流控制而非人工控制的开关。我们可以将继电器、开关、灯泡和两节电池按照下图连接。\n\n注意，左边的开关是断开的，灯泡没有发光。当闭合开关的时候，左端电池产生电流流过缠在铁芯上的圆线圈。于是铁芯产生了磁性，将上面的弹性金属簧片拉下，使回路接通，灯泡发光。\n\n编码隐匿在计算机软硬件背后的语言\n\n112","previous_page":111,"next_page":113}