本题目来源于试卷: Physics Unit18: Electric Currents，类别为 通用国际物理
[单选题]
The heating element in an electric drier operates on 240 V and gener y: qeyom *fuol(75hr0ates heath. 4tou/ 4uquuhl o*i)g co/j, at the rate of 2.1 kW. The heating element shorts out and, in repairing it, thuj u* cuoithul.h/4) go,/4 qoe owner shortens the Nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?
A. Power is still 2.0 kW.
B. Power increases to 2.2 kW.
C. Power decreases to 1.8 kW.
D. none of the given answers
参考答案: B
本题详细解析:
暂无
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