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【简答题】
下面是一道作业题及某学生的解答。 题目：如图，足够长的U形导体框架的宽为L，电阻忽略不计，其所在平面为竖直平面，磁感应强度为B的磁场方向垂直于导体框平面，磁场足够大，一根质量m，有效电阻为R的水平导体棒MN垂直于U形框架间，接触良好。导体棒从静止开始沿框架下滑到刚开始匀速运动时，通过导体棒截面的电量为Q，求导体棒从开始下滑到刚开始匀速运动这一过程中．电流对导体棒所做的功. 匀速运动过程中，电流对导体棒所做的功： 问题： （1）指出错误，分析错误的原因，给出正解。（10分） （2）给出教学思路，帮助学生掌握相关知识。（10分）
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举一反三
【简答题】Part A Write an invitation letter. Suppose you were Li Ming, you will invite Wang Lin, your best friend, to go for a picnic and your American friend, Tom, will go together with you. You should write a...
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【简答题】Suppose you were taken good care of by Aunt Wang when you visited Shanghai where she lived. Write a letter to her to extend your appreciation. Begin your letter as follows: Dear Aunt Wang, You should ...
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【单选题】— I ran into ______ back of ______ truck yesterday and damaged my car badly. — I suppose you were driving too fast. [     ]
A.
the; the
B.
a; a
C.
the; a
D.
a; the
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【单选题】在纯电阻正弦交流电路中,端电压 V,电阻为10 Ω,若端电压u和总电流i参考方向一致,则有___。
A.
A
B.
A
C.
A
D.
A
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【简答题】Suppose you lived at the Rehabilitation Center and were under tender care. You write a letter to extend your thanks to your staffs consideration. Begin your letter as follows: Dear staff, You should w...
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【单选题】在纯电阻正弦交流电路中,端电压 V,电阻为10 Ω,若端电压u和总电流i参考方向一致,则有关电流的瞬时值i、有效值相量、有效值I的下列结论,正确的是______
A.
A
B.
A
C.
A
D.
i=22∠0°A
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【单选题】You were ________ to close the windows. Why were you so careless? [     ]
A.
allowed
B.
believe
C.
supposed
D.
caused
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【简答题】在纯电阻正弦交流电路中,已知端电压 V。 电阻 Ω, 那么电流 _________________, 电压与电流的相位差为________________, 电阻上消耗的功率为 _____________ 。
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【单选题】在纯电阻正弦交流电路中,端电压u=220 sin ω t V,电阻为10Ω,若端电压u和总电流i参考方向一致,则有关电流的瞬时值i、有效值相量 、有效值 I 的下列结论,正确的是 。
A.
=22A
B.
I =220 sin ω t A
C.
i=22 sinωt A
D.
i=22∠0° A
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相关题目：
【简答题】Part A Write an invitation letter. Suppose you were Li Ming, you will invite Wang Lin, your best friend, to go for a picnic and your American friend, Tom, will go together with you. You should write a...
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【单选题】— I ran into ______ back of ______ truck yesterday and damaged my car badly. — I suppose you were driving too fast. [     ]
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【单选题】在纯电阻正弦交流电路中,端电压 V,电阻为10 Ω,若端电压u和总电流i参考方向一致,则有___。
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【单选题】在纯电阻正弦交流电路中,端电压 V,电阻为10 Ω,若端电压u和总电流i参考方向一致,则有关电流的瞬时值i、有效值相量、有效值I的下列结论,正确的是______
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A
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A
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D.
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【单选题】You were ________ to close the windows. Why were you so careless? [     ]
A.
allowed
B.
believe
C.
supposed
D.
caused
查看完整题目与答案
【简答题】在纯电阻正弦交流电路中,已知端电压 V。 电阻 Ω, 那么电流 _________________, 电压与电流的相位差为________________, 电阻上消耗的功率为 _____________ 。
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【单选题】在纯电阻正弦交流电路中,端电压u=220 sin ω t V,电阻为10Ω,若端电压u和总电流i参考方向一致,则有关电流的瞬时值i、有效值相量 、有效值 I 的下列结论,正确的是 。
A.
=22A
B.
I =220 sin ω t A
C.
i=22 sinωt A
D.
i=22∠0° A
查看完整题目与答案