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)](/uploads/image/z/10331216-8-6.jpg?t=barron+sat+%E7%89%A9%E7%90%86%E9%A2%98BARRON%27S+SAT+%E7%89%A9%E7%90%86+%E7%AC%AC10%E9%A1%B5%28Diagnostic+test+%E7%AC%AC15%E9%A2%98%29The+following+five+lengths+of+thin+wire%2C+all+of+which+have+the+same+diameter+and+length%2C+are+connected+in+a+circuit+to+a+battery%3A%28A%293+m+of+nichrome+wire%28B%293+m+of+copper+wire%28C%29)
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