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 ele jqc b;4o6ox/j/8jkfwctrdj+j.x, ew .sp+vhdqtb d 0*2pic drier operates on 240 V and generates heat at the rate of 2.1 kW. The heating element shorts out and, in repairing it, the 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 diss+ ph2,ewtbvsqdd+j x0 jpd*.. ipated 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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