配套习题- 电学综合题解题技巧（1） -【青果学院】

1/5多选题

难度：

1.

如图所示，电源电压为36v，电流表量程为0—0.6A，电压表量程0—15V，灯泡铭牌“PZ24V，6W”（设灯丝电阻不随温度变化）滑动变阻器最大电阻值100Ω，在保证电路安全的前提下，调节滑动变阻器时，则下列说法正确的是（）

A	灯泡的电阻为48Ω
B	滑动变阻器阻值调到48Ω时，灯泡的实际功率为6W
C	灯泡的功率变化范围4.6W-6W
D	滑动变阻器的阻值范围12Ω-100Ω

正确答案：QixD

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

2/5单选题

难度：

2.如图所示的电路图中，电源两端电压保持不变，滑动变阻器的最大阻值为R₃。若只闭合开关S₁，将滑动变阻器的滑片P置于A端时，电压表V₁的示数为U₁，电压表V₂的示数为U₂；若此时将滑动变阻器的滑片P移至B端，电压表V₁的示数变为U₁′，电压表V₂的示数变为U₂′，电流表A₁的示数为0.4A。当开关都闭合，滑动变阻器的滑片P置于B端时，电流表A₂的示数为I₂。已知U₁∶U₁′＝1∶2，U₂∶U₂′＝3∶1，R₂＝3W。下列说法正确的是（）

A	R₁=2Ω U=6V
B	I₂=2.6A U=12V
C	R₁=4Ω I₂=2.6A
D	R₃=10Ω I₂=2A

正确答案：QQ==

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

3/5单选题

难度：

3.如图所示电路总电压不变。只闭合开关S₃，滑动变阻器的滑片P在最左端时，电路消耗总功率为10W，电流表的示数为I₁；只断开开关S₁，滑片P移至最右端时，电流表的示数为I₂，电压表的示数为U₁；只闭合开关S₁，滑片P仍在最右端时，电压表示数为U₂。若I₁∶I₂＝5∶3，U₁∶U₂＝2∶3。则在上述三个状态中，电路消耗总功率的最小值为（）

A	6W
B	3.2W
C	4.8W
D	3.6W

正确答案：RA==

PHRhYmxlIGNsYXNzPU1zb05vcm1hbFRhYmxlIGJvcmRlcj0wIGNlbGxzcGFjaW5nPTAgY2VsbHBhZGRpbmc9MCB3aWR0aD02NTAgc3R5bGU9J3dpZHRoOjQ4Ny41cHQ7bWFyZ2luLWxlZnQ6Ny41cHQnPiA8dHI+ICA8dGQgc3R5bGU9J3BhZGRpbmc6Ny41cHQgMGNtIDcuNXB0IDBjbSc+ICA8ZGl2Puino++8muWPqumXreWQiOW8gOWFs1M8c3ViPjMgPC9zdWI+77yM5ruR5Yqo5Y+Y6Zi75Zmo55qE5ruR54mHUCDlnKjmnIDlt6bnq6/ml7bvvIzlj6rmnIlSPHN1Yj4xIDwvc3ViPuaOpeWFpeeUtei3r++8myA8YnI+ICDlj6rmlq3lvIDlvIDlhbNTPHN1Yj4xPC9zdWI+77yM5ruR54mHUCDnp7voh7PmnIDlj7Pnq6/ml7bvvIxSPHN1Yj4xIDwvc3ViPuWSjFI8c3ViPjIgPC9zdWI+5Liy6IGU5o6l5YWl55S16Lev77ybIDxicj4gIOWPqumXreWQiOW8gOWFs1M8c3ViPjEgPC9zdWI+77yM5ruR54mHUCDku43lnKjmnIDlj7Pnq6/ml7bvvIxSPHN1Yj4xPC9zdWI+IOOAgVI8c3ViPjIgPC9zdWI+5ZKMUjxzdWI+MyA8L3N1Yj7kuLLogZTmjqXlhaXnlLXot6/vvJsgPGJyPiAg5LiJ5Liq55S16Lev54q25oCB5aaC5Zu+5omA56S677yaPC9kaXY+ICA8L3RkPiA8L3RyPiA8dHI+ICA8dGQgc3R5bGU9J3BhZGRpbmc6Ny41cHQgMGNtIDcuNXB0IDBjbSc+ICA8ZGl2PjxpbWcgICB3aWR0aD00MDggaGVpZ2h0PTEwNiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzI1LzBDL3JCQUNFMU1OZlZpeXJ6WkdBQUE4V1dBbktQRTk1My5wbmciICAgPjwvZGl2PiAgPC90ZD4gPC90cj4gPHRyPiAgPHRkIHN0eWxlPSdwYWRkaW5nOjcuNXB0IDBjbSA3LjVwdCAwY20nPiAgPGRpdj7nlLXmupDnlLXljovkuI3lj5jvvIw8YnI+ICA8aW1nIHdpZHRoPTMxMCBoZWlnaHQ9NjYgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yNS8wQy9yQkFDRTFNTmZWakNidGp6QUFBSVIzRVdsdFUzNjcucG5nIiAgID48YnI+ICA8aW1nIHdpZHRoPTI1MiBoZWlnaHQ9NTkgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8wMi8xQi9yQkFDRkZNTmZWaXlNRGdXQUFBRzJHWEdkbmcwMDcucG5nIiAgID48YnI+ICDnlLXmupDnlLXljovkuI3lj5jvvIw8aW1nIHdpZHRoPTE5OSBoZWlnaHQ9NjAgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8wMi8xQi9yQkFDRkZNTmZWakE5OGF0QUFBRmtuQWFmU1E5MDMucG5nIiAgID48YnI+ICA8aW1nIHdpZHRoPTMyMyBoZWlnaHQ9NTkgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yNS8wQy9yQkFDRTFNTmZWanhBM21xQUFBSVRoQjdmZDQxNzcucG5nIiAgID48YnI+ICDnlLXljovkuIDlrprvvIzlip/njofot5/nlLXpmLvmiJDlj43mr5TvvIzmiYDku6XvvIznrKzkuInnirbmgIHnlLXot6/mgLvlip/njofmnIDlsI8uIDxicj4gIDxpbWcgd2lkdGg9MzIwIGhlaWdodD04NCBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAyLzFCL3JCQUNGRk1OZlZpUlBBX0FBQUFLbVJlanRBbzk0NC5wbmciICAgPjxicj4gIDxpbWcgd2lkdGg9MjQ4IGhlaWdodD01MCBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAyLzFCL3JCQUNGRk1OZlZpUWNnNDNBQUFHZW5ER2V5ODAxNi5wbmciICAgPjwvZGl2PiAgPC90ZD4gPC90cj48L3RhYmxlPg==

4/5单选题

难度：

4.

如图所示电路中，灯L₁的电阻R₁是灯L₂电阻R₂的（不考虑灯丝电阻随温度的变化），电源电压为10V且保持不变. 当闭合开关S₀、S₁，断开开关S₂时，灯L₁正常发光，电阻R₃消耗的电功率为2W，电压表示数为U₁；当闭合开关S₂，断开开关S₀、S₁时，电阻R₄消耗的电功率为0.25W，电压表示数为U₁. 以下说法正确的是（）

A	电流表前后两次示数之比为1/2
B	电流表前后两次示数之比2/3
C	灯L₁的额定电功率是3W
D	电阻R₄的阻值是6Ω

正确答案：Qw==

PGRpdj7op6PvvJrpl63lkIjlvIDlhbM8aT5TPC9pPjxzdWI+MDwvc3ViPuOAgTxpPlM8L2k+PHN1Yj4xPC9zdWI+77yM5pat5byA5byA5YWzPGk+UzwvaT48c3ViPjI8L3N1Yj7ml7bvvIznga9MPHN1Yj4xPC9zdWI+5LiO55S16Zi7PGk+UjwvaT48c3ViPjM8L3N1Yj7kuLLogZTmjqXlnKjnlLXmupDkuKTnq6/vvIznlLXljovooajmiYDnpLrkuLrnga9MPHN1Yj4xPC9zdWI+5Lik56uv55qE55S15Y6LPGk+VTwvaT48c3ViPjE8L3N1Yj7vvIzpgJrov4fnlLXmtYHooahB55qE55S15rWB5Li6PGk+STwvaT7vvIznga9MPHN1Yj4xPC9zdWI+55qE6aKd5a6a55S15Yqf546H5Li6PGk+UDwvaT48c3ViPjE8L3N1Yj7vvIw8aT5SPC9pPjxzdWI+Mzwvc3ViPua2iOiAl+eahOeUteWKn+eOhzxpPlA8L2k+PHN1Yj4zPC9zdWI+77yM5YiZ77yaPC9kaXY+PGRpdj48aW1nIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjUvMEMvckJBQ0UxTU5mVnZEU3hRbEFBQUREM29oMG1BNDQ4LnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yNS8wQy9yQkFDRTFNTmZWdkRTeFFsQUFBREQzb2gwbUE0NDgucG5nIiBoZWlnaHQ9IjQ4IiB3aWR0aD0iMTE4Ij7ikaA8L2Rpdj48ZGl2PjxpPlA8L2k+PHN1Yj4xPC9zdWI+PTxpPkk8L2k+PHN1cD4yPC9zdXA+PGk+UjwvaT48c3ViPjE8L3N1Yj7ikaE8L2Rpdj48ZGl2PjxpPlA8L2k+PHN1Yj4zPC9zdWI+PTxpPkk8L2k+PHN1cD4yPC9zdXA+PGk+UjwvaT48c3ViPjM8L3N1Yj7ikaI8L2Rpdj48ZGl2PumXreWQiOW8gOWFszxpPlM8L2k+PHN1Yj4yPC9zdWI+77yM5pat5byA5byA5YWzPGk+UzwvaT48c3ViPjA8L3N1Yj7jgIE8aT5TPC9pPjxzdWI+MTwvc3ViPuaXtu+8jOeBr0w8c3ViPjE8L3N1Yj7jgIFMPHN1Yj4yPC9zdWI+5LiO55S16Zi7PGk+UjwvaT48c3ViPjQ8L3N1Yj7kuLLogZTmjqXlnKjnlLXmupDkuKTnq6/vvIznlLXljovooajmiYDnpLrkuLrnga9MPHN1Yj4xPC9zdWI+5Lik56uv55qE55S15Y6LPGk+VTwvaT48c3ViPjE8L3N1Yj48c3VwPi88L3N1cD7vvJ08aW1nIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDIvMUIvckJBQ0ZGTU5mVnZpb2pWVkFBQUJVenhPMWxFNjE2LnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8wMi8xQi9yQkFDRkZNTmZWdmlvalZWQUFBQlV6eE8xbEU2MTYucG5nIiBoZWlnaHQ9IjQyIiB3aWR0aD0iMTciPjxpPlU8L2k+PHN1Yj4xPC9zdWI+77yM6YCa6L+H55S15rWB6KGoQeeahOeUtea1geS4ujxpPkk8c3VwPi88L3N1cD48L2k+77yM55S16Zi7PGk+UjwvaT48c3ViPjQ8L3N1Yj7mtojogJfnmoTnlLXlip/njofkuLo8aT5QPC9pPjxzdWI+NDwvc3ViPu+8jOWIme+8mjwvZGl2PjxkaXY+PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAyLzFCL3JCQUNGRk1OZlZ1U2xJZG5BQUFELW1rWXo4TTIwMS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDIvMUIvckJBQ0ZGTU5mVnVTbElkbkFBQUQtbWtZejhNMjAxLnBuZyIgaGVpZ2h0PSI0OCIgd2lkdGg9IjE2NSI+IOKRozwvZGl2PjxkaXY+PGk+UDwvaT48c3ViPjQ8L3N1Yj49PGk+STxzdXA+Lzwvc3VwPjwvaT48c3VwPjI8L3N1cD48aT5SPC9pPjxzdWI+NDwvc3ViPuKRpCDigKYgMeWIhjwvZGl2PjxkaXY+55Sx4pGg4pGj5byP6Kej5b6X77yaPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAyLzFCL3JCQUNGRk1OZlZ1dzBLNURBQUFDR1FicGZFNDM3MS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDIvMUIvckJBQ0ZGTU5mVnV3MEs1REFBQUNHUWJwZkU0MzcxLnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjUwIj4g4oCm4oCm4oCm4oCm4oCm4oCm4oCmMeWIhjwvZGl2PjxkaXY+55Sx4pGi4pGk5byP6Kej5b6X77yaPGk+UjwvaT48c3ViPjM8L3N1Yj7vvJ0yPGk+IFI8L2k+PHN1Yj40IDwvc3ViPjwvZGl2PjxkaXY+5YaN55Sx4pGg4pGj5byP6Kej5b6X77yaPGk+UjwvaT48c3ViPjE8L3N1Yj7vvJ0zPGk+IFI8L2k+PHN1Yj40PC9zdWI+77ydPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzI1LzBDL3JCQUNFMU1OZlZ2VE9ZeXVBQUFCaEFzbW5rczU1Ni5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjUvMEMvckJBQ0UxTU5mVnZUT1l5dUFBQUJoQXNtbmtzNTU2LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjE3Ij48aT5SPC9pPjxzdWI+MyA8L3N1Yj7igKYgMeWIhjwvZGl2PjxkaXY+55Sx4pGh4pGi5byP6Kej5b6X77yaPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzI1LzBDL3JCQUNFMU1OZlZ5Q205cTRBQUFDV1dHWC11czM4NC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjUvMEMvckJBQ0UxTU5mVnlDbTlxNEFBQUNXV0dYLXVzMzg0LnBuZyIgaGVpZ2h0PSI0NiIgd2lkdGg9IjUwIj48L2Rpdj48ZGl2PjxpPlA8L2k+PHN1Yj4xPC9zdWI+PTxpbWcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yNS8wQy9yQkFDRTFNTmZWdlRPWXl1QUFBQmhBc21ua3M1NTYucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzI1LzBDL3JCQUNFMU1OZlZ2VE9ZeXVBQUFCaEFzbW5rczU1Ni5wbmciIGhlaWdodD0iNDIiIHdpZHRoPSIxNyI+PGk+UDwvaT48c3ViPjM8L3N1Yj49M1cg4oCm4oCm4oCm4oCm4oCm4oCm4oCmMeWIhjwvZGl2PjxkaXY+5bCGPGk+UDwvaT48c3ViPjE8L3N1Yj7ku6PlhaXikaHlvI/op6PlvpfvvJo8aT5SPC9pPjxzdWI+MTwvc3ViPu+8nTEyzqk8L2Rpdj48ZGl2PjxpPlI8L2k+PHN1Yj40PC9zdWI+77ydNM6pIOKApuKApuKApiAx5YiGPGJyPjwvZGl2PjxkaXY+5pWF5q2j56Gu562U5qGI5Li6Qzxicj48L2Rpdj4=

5/5单选题

难度：

5.

如图所示，电源两端电压U=9V 保持不变。当开关 S₁闭合、S₂断开，滑动变阻器滑片 P在中点时，电压表 V₁示数为 U₁，电压表 V₂示数为 U₂，电流表示数为 I₁；当滑动变阻器滑片 P移至 B端时，电压表 V₁示数为U₁′，电压表 V2示数为 U₂′，电流表示数为 I₂；当开关 S₁、S₂都闭合，滑动变阻器滑片 P 移至 A 端时，电流表示数为 I₃。已知： R₁=12Ω，U₁∶U₁′=2∶3，I₂∶I₃=1∶3。则以下说法正确的是（）

A	U₂∶U₂′=2∶3
B	U₂∶U₂′=2∶1
C	R₁∶R₂=2∶1
D	R₁∶R₂=2∶3

正确答案：Qw==

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