barron sat 物理题BARRON'S SAT 物理 第10页(Diagnostic test 第15题)The following five lengths of thin wire, all of which have the same diameter and length, are connected in a circuit to a battery:(A)3 m of nichrome wire(B)3 m of copper wire(C)

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barron sat 物理题BARRON'S SAT 物理 第10页(Diagnostic test 第15题)The following five lengths of thin wire, all of which have the same diameter and length, are connected in a circuit to a battery:(A)3 m of nichrome wire(B)3 m of copper wire(C)
barron sat 物理题
BARRON'S SAT 物理 第10页(Diagnostic test 第15题)
The following five lengths of thin wire, all of which have the same diameter and length, are connected in a circuit to a battery:
(A)3 m of nichrome wire
(B)3 m of copper wire
(C)3 m of lead wire
(D)3 m of steel wire
(E)3 m of iron wire
14.In which length of wire is the current greatest
15.Which length of wire generates the greatest power?
答案：
14 B Copper has the least resistance of all the metals listed and therefore the greatest current.
15题答案选A,理由是:
Nichrome has the highest resistance of all the metals listed. Since power is proportional to resistance, nichrome generates the greatest power.
但我认为既然14题选b,15也应该选B..这里似乎应该使用P=U^2/R

barron sat 物理题BARRON'S SAT 物理 第10页(Diagnostic test 第15题)The following five lengths of thin wire, all of which have the same diameter and length, are connected in a circuit to a battery:(A)3 m of nichrome wire(B)3 m of copper wire(C)
两个 都选B 用应该用p=U*I 电压相等 电阻越大电流越小 copper的电阻最小 电流最大 所以 功率最大

其实楼主 巴朗SAT上是有挺多错题的

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