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    14.素養(4)
1 某電路電流為5A,現需1個10Ω電阻器,下列4種規格不同的電阻器中,何者為宜?
A 10Ω,150W
B 10Ω,100W
C 10Ω,300W
D 10Ω,50W

P = I2 × R = 52 × 10 = 250W

至少要250W,所以選 300W