SAT II 物理题(BARRON)
问题描述：
SAT II 物理题(BARRON)
2008 BARRON'S SAT 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
Which length of wire generates the greatest power?
理由是:
Nichrome has the highest resistance of all the metals listed.Since power is proportional to resistance,nichrome generates the greatest power.
但我认为应该选B..这里似乎应该使用P=U^2/R
答
在这里要注意到 are connected in a circuit to a battery:
这里用的是are,也就是它们都在电路里,那么这里的意思是它们是串联的吧.并联五条导线?用打结的方式来连接?