44. The heater element of a particular 120-V toaster is a 8.9-m length of nichrome wire, whose diameter is 0.86 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 x 10-6 Ω. If the toaster is operated at a voltage of 120 V, how much power does it draw?
(A) 720 W
(B) 700 W
(C) 750 W
(D) 770 W
(E) 800 W.

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統計: A(8), B(1), C(2), D(0), E(1) #3093885

詳解 (共 1 筆)

#6071877
R = rho*length/area
W  = V square / R
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晚點回電腦補算數字。
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