发电厂发电机的输出电压为U1，发电厂至学校的输电线电阻为R，通过电线的电流为I，学校输入电压为U2，下面计算输电线功率损失的式子中不正确的是 ( )

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发电厂发电机的输出电压为U₁，发电厂至学校的输电线电阻为R，通过电线的电流为I，学校输入电压为U₂，下面计算输电线功率损失的式子中不正确的是 ( )

A： $\frac{{U_{1}}^{2}}{R}$

B： $\frac{{(U_{1} - U_{2})}^{2}}{R}$

C：I²R

D：I(U₁-U₂)

上一题下一题 0.0难度选择题更新时间:2019-06-22 09:39:37

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A

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A: Morning! What can I do for you?
B: We’d like to make a trip for a weekend holiday, please.
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B: We’d like to choose Jinggang Mountains.
A: It’s really worth visiting. ____ ?
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A: The Holiday Home is very good. What’s more important, ____ .
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A: ____ ?
B: OK. I’ll ask my wife to fill in this form. By the way, is it all right if we pay by credit card?
A: ____ . Enjoy your weekend.
B: Thank you.

A. Will you please fill in this form?
B. Where would you like to visit?
C. Which path would you like to choose?
D. Which hotel do you want to live in?
E. it’s inexpensive.
F. Sure.

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