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	<title>无聊空间 &#187; 串联</title>
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		<title>LED电路在12伏特下计算串联降压电阻大小计算公式实例</title>
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		<pubDate>Wed, 18 Jun 2008 07:30:11 +0000</pubDate>
		<dc:creator>坚坚</dc:creator>
				<category><![CDATA[LED电路]]></category>
		<category><![CDATA[串联]]></category>
		<category><![CDATA[计算公式]]></category>
		<category><![CDATA[降压电阻]]></category>

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		<description><![CDATA[4个LED串联在一起的LED电路，在12伏供电下，假设单个LED电压为2伏，LED的电流为20毫安的情况下限流电阻的计算公式： LED顺向电压为2伏×4个=8伏 电阻需要承受的电压为12伏-8伏=4伏 U=4V LED的电流为... ]]></description>
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