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 <title><![CDATA[90W的灯具，为何有0.9安电流？]]></title>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1446140.html]]></link>
 <description><![CDATA[Latest 50 replies of 90W的灯具，为何有0.9安电流？]]></description>
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 <description><![CDATA[工控人家园]]></description>
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 <title><![CDATA[]]></title>
 <description><![CDATA[没看明白，我是猪头]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1446140#1533322.html]]></link>
 <author><![CDATA[wangfuwang]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sat, 11 Jan 2014 12:31:03 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[都是高手啊，长知识了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1446140#1533260.html]]></link>
 <author><![CDATA[qj_wgx]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sat, 11 Jan 2014 08:13:42 +0000]]></pubdate>
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 <description><![CDATA[纯电阻负载交流电，电压与电流是同相的，就是电压最高时电流最大。
电感式镇流器的日光灯的功率因数，实际是电压与电流有相位差。
见图。图A是电感式镇流器的日光灯线路，图B是电压V0与电流I0间有相位差φ，COSφ就是功率因数了。
算功率因数的定义式：COSφ(功率因数) = VB*IL(有效功率)/V0*I0(视在功率)
因为镇流器与灯 ..]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1446140#1533021.html]]></link>
 <author><![CDATA[thcgw]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 10 Jan 2014 08:42:54 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[高频开关的电流测不准]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1446140#1533018.html]]></link>
 <author><![CDATA[wananjushi]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 10 Jan 2014 08:37:38 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[电感式镇流器的功率因数只有0.5。根据P=cos&cent;IU&nbsp;&nbsp;]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1446140#1533016.html]]></link>
 <author><![CDATA[thcgw]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 10 Jan 2014 08:33:50 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[buzhidoa]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1446140#1532338.html]]></link>
 <author><![CDATA[qqqq23344]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 08 Jan 2014 06:58:37 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[高频开关的电流测不准吧,就象你拿钳表去测变频器输出电流. [s:21]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1446140#1532236.html]]></link>
 <author><![CDATA[子丑寅卯9]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 08 Jan 2014 02:53:28 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[测的是实际电流有效值]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1446140#1531764.html]]></link>
 <author><![CDATA[sanlihu]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Tue, 07 Jan 2014 00:40:54 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[[s:28] 功率因数会那么低？你买的灯盘是啥质量的啊！不会是整流器耗电不对吧！]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1446140#1531631.html]]></link>
 <author><![CDATA[理论初学者]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Mon, 06 Jan 2014 08:33:07 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[功率因数很低]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1446140#1531600.html]]></link>
 <author><![CDATA[dugjj]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Mon, 06 Jan 2014 07:15:56 +0000]]></pubdate>
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