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AP® Physics C: E & M

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Current in a Light Bulb Filament

APPHEM-BIF8KR

A $100 \text { } \mathrm{W}$ incandescent light bulb runs for $1 \text { } \mathrm{hour}$. The voltage drop across the bulb is $70 \text { } \mathrm{V}$.

Calculate the amount of current flowing through the filament.

A

$4.0 \times 10^{-4} \text{ } \mathrm{\cfrac{W}{Vs}}$

B

$1.4 \text{ } \mathrm{\cfrac{W}{V}}$

C

$86 \text{ } \mathrm{\cfrac {W\cdot {min}}{V}}$

D

$5100 \text{ } \mathrm{\cfrac{W\cdot{s}}{V}}$

E

$7000 \text{ } \mathrm{W\cdot{A}}$