发电站向用电区输送电能,在输电功率不变及输电线电阻R不变的情况下,如将输电线电压提高到原来的10倍,则输电线上每秒钟损失的电能为原来损失电能的()
A 10倍 B 100倍 C 1/10倍 D 1/100倍
人气:218 ℃ 时间:2020-02-03 06:48:01
解答
由于P=UI
在P不变的情况下,U升高为原来的10倍,I就变为原来的1/10.
输电线上消耗的功率主要是发热,由焦尔定律
Q=I^2Rt
可知,R和t不变,Q耗就变为原来的1/100.所以D是正确的.
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