本题目来源于试卷: Scientific Skills & Tools，类别为 IB物理学
[单选题]
Which of the following units is not a unit of power?
A. $W$
B. $J$
C. N$\:m\:s^{-1}$
D. J$\:s^{-1}$
参考答案: B
本题详细解析:
The SI unit of power is W and it is defined as J s−1. Additionally, power can be calculated by
P = Fv
When units of force and speed are substituted in the equation, the units become
N m s−1 But J is the SI unit of energy.
Therefore, the answer is B.
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