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    14.素養(4)
1 一直流電動機,在周圍溫度為35.5°C下運轉,其電阻由90Ω升至96Ω,則其溫度升高
A 6°C
B 12°C
C 18°C
D 24°C

銅: Rt2Rt1 = 234.5+t2234.5+t1

9690 = 234.5+t2234.5+35.5

t2=53.5°C

Dt=t2-t1=53.5-35.5=18°C