三个51欧的电阻连接成三角形,这样的电路有什么作用?
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发布时间：2022-10-21 04:38
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时间：2024-11-18 19:33
R<sub>BC</sub>=<span class="MathZyb" mathtag="math" style="whiteSpace:nowrap;wordSpacing:normal;wordWrap:normal"><table cellpadding="-1" cellspacing="-1" style="margin-right:1px"><tr><td style="border-bottom:1px solid black;padding-bottom:1px;font-size:90%"><span><span>R</span><span style="vertical-align:sub;font-size:90%">3</span></span>(<span><span>R</span><span style="vertical-align:sub;font-size:90%">1</span></span>+<span><span>R</span><span style="vertical-align:sub;font-size:90%">2</span></span>)</td></tr><tr><td style="padding-top:1px;font-size:90%"><span><span>R</span><span style="vertical-align:sub;font-size:90%">1</span></span>+<span><span>R</span><span style="vertical-align:sub;font-size:90%">2</span></span>+<span><span>R</span><span style="vertical-align:sub;font-size:90%">3</span></span></td></tr></table></span>
对比两式，原来时两等效电阻相等，则说明R<sub>1</sub>=R<sub>3</sub>；
要使R<sub>AB</sub>＞R<sub>BC</sub>，应增大R<sub>1</sub>或减小R<sub>3</sub>；
故选：AD．
