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【冲刺2021】中考物理最后10天速速提分专题:08 动态电路分析与计算(原卷版和解析版)

ID:145484 2021年06月08日 资料纠错 有奖上传 收藏
【内容简介】类型一 动态电路分析一、滑动变阻器滑片移动引起的动态电路分析1.如图所示的电路中,电源电压保持不变,闭合开关S,当滑动变阻器的滑片P向左滑动时,下列判断正确的是(  )A.电压表V1示数变小B.电压表V2示数不变C.灯泡L的亮度不变D.电压表V1与电流表A示数比值变小【分析】由电路图可知,灯泡L与滑动变阻器R串联,电压表V1测电源两端的电压,电压表V2测R两端的电压,电流表测电路中的电流,根据电源的电压可知滑片移动时电压表V1示数的变化,根据滑片的移动可知接入电路中电阻的变化,根据欧姆定律可知电路中电流的变化,然后得出电压表V1与电流表A示数比值变化,根据串联电路的分压特点可知R和L两端分得的电压变化,根据P=UI可知灯泡实际功率的变化,进一步得出亮暗变化。【解答】解:由电路图可知,灯泡L与滑动变阻器R串联,电压表V1测电源两端的电压,电压表V2测R两端的电压,电流表测电路中的电流,因电源电压保持不变,所以,滑片移动时,电压表V1示数不变,故A错误;当滑动变阻器的片P向左滑动时,变阻器接入电路中的电阻变小,电路的总电阻变小,由I= 可知,电路中的电流变大,即电流表A的示数变大,则电压表V1与电流表A示数比值变小,故D正确;变阻器接入电路中的电阻变小,由串联电路的分压特点可知,R两端分得的电压变小,即电压表V2示数变小,故B错误;电源电压不变,R两端分得的电压变小,则灯泡L两端的电压变大,因灯泡的亮暗取决于实际功率的大小,所以,由P=UI可知,灯泡的实际功率变大,灯泡变亮,故C错误。故选:D。2.如图所示,电源电压保持不变,开关S闭合后,调节滑动变阻器滑片,下列说法正确的是(  )A.滑片向左滑动,电流表示数增大,电压表示数减小B.滑片向左滑动,电流表、电压表示数都增大C.滑片向右滑动,电流表、电压表示数都增大D.滑片向右滑动,电流表示数减小,电压表示数增大【分析】由电路图可知,灯泡L与滑动变阻器串联,电压表测L两端的电压,电流表测电路中的电流,根据滑片的移动可知接入电路中电阻的变化,根据欧姆定律可知电路中电流的变化,根据串联电路的分压特点可知灯泡两端的电压变化。【解答】解:由电路图可知,灯泡L与滑动变阻器串联,电压表测L两端的电压,电流表测电路中的电流,当滑片向左滑动时,变阻器接入电路中的电阻减小,电路的总电阻减小,由I= 可知,电路中的电流增大,即电流表的示数增大,变阻器接入电路中的电阻减小,由串联电路的分压特点可知,变阻器两端的电压减小,灯泡两端的电压增大,即电压表的示数增大,故A错误、B正确;同理可知,滑片向右滑动时,电流表、电压表的示数都减小,故CD错误。故选:B。3.如图所示电路中,电源电压不变,R1为定值电阻,闭合开关S,当滑动变阻器滑片P向右移动时,下列判断正确的是(  )A.电流表A的示数变大B.电压表V1的示数变大C.电路中消耗的总功率变大D.电压表V2与电流表A示数的比值变小【分析】由图可知:定值电阻R1与滑动变阻器R2串联,电压表V1测R2两端的电压,电压表V2测量R1两端的电压,电流表测电路中的电流。根据滑片的移动可知接入电路中电阻的变化,根据欧姆定律可知电路中电流的变化和R1两端的电压变化,根据P=UI判断功率的变化;再根据欧姆定律结合定值电阻的阻值判断电压表和电流表示数的比值变化。【解答】解:由电路图可知,R1与滑动变阻器R2串联,电压表V1测R2两端的电压,电压表V2测量R1两端的电压,电流表测电路中的电流。A、当滑动变阻器的滑片P向右移动时,变阻器接入电路中的电阻变小,电路中的总电阻变小,由I= 可知,电路中的电流变大,即电流表的示数变大,故A正确;B、由U=IR可知,R1两端的电压变大,即电压表V2的示数变大,由于电源电压不变,根据串联电路的总电压等于各分电阻两端的等于之和可知:R2两端的电压变小,即电压表V1的示数变小,故B错误;C、电源电压不变,电路中的电流变大,根据P=UI可知电路中消耗的总功率变大,故C正确;D、由R= 可知,电压表V2与电流表A示数的比值等于定值电阻R1的阻值,则两者的比值不变,故D错误。故选:AC。
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    【冲刺2021】中考物理最后10天速速提分专题:08 动态电路分析与计算(原卷版和解析版)