模塊 ISI222 感應(yīng)電流影響大小的因素：①導(dǎo)線切割的速度大小；②導(dǎo)線切割的速度方向；③永磁體的強(qiáng)度；④切割導(dǎo)線的條數(shù)；⑤切割導(dǎo)線的有效長(zhǎng)度。閉合回路在原磁場(chǎng)內(nèi)產(chǎn)生的磁場(chǎng)阻礙原磁場(chǎng)磁通量發(fā)生變化的電流叫做感應(yīng)電流。
感應(yīng)電動(dòng)勢(shì)公式：根據(jù)法拉第電磁感應(yīng)定律：eBLvsinθ（θ是B與v的夾角）當(dāng)導(dǎo)體在磁場(chǎng)中靜止或平行于磁感線運(yùn)動(dòng)時(shí)，磁通量沒(méi)有發(fā)生變化，所以無(wú)論磁場(chǎng)多強(qiáng)，閉合回路中都無(wú)感應(yīng)電流。
感應(yīng)電流方向判斷
判斷方法：使用右手定則，即：伸開(kāi)右手，使拇指與其余四個(gè)手指垂直，并且都與手掌在同一平面內(nèi)；讓磁感線從手心進(jìn)入，并使拇指指向?qū)Ь運(yùn)動(dòng)方向，這時(shí)四指所指的方向就是感應(yīng)電流的方向。
影響感應(yīng)電流的方向的是線圈轉(zhuǎn)動(dòng)方向和磁場(chǎng)方向。
電磁學(xué)中，右手定則判斷的主要是與力無(wú)關(guān)的方向。
還可以根據(jù)楞次定律，感應(yīng)電流產(chǎn)生的磁場(chǎng)方向阻礙原磁場(chǎng)的變化，再利用右手螺旋定則判斷電流在線圈中的方向。
感應(yīng)電流和電流的區(qū)別
電流定律：指電荷的定向移動(dòng)。電流的大小稱為電流強(qiáng)度（簡(jiǎn)稱電流，符號(hào)為I），是指單位時(shí)間內(nèi)通過(guò)導(dǎo)線某一截面的電荷量。
感應(yīng)電流的定律：由于穿過(guò)閉合回路的磁通量發(fā)生變化在閉合回路中產(chǎn)生的電流叫做感應(yīng)電流。感應(yīng)電流用右手定則判斷
模塊 ISI222
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模塊 ISI222
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