Question: A 5 0 m m * * 4 5 m m * * 2 0 m m cell phone charger ( the shape of the

50 m m * * 45 m m * * 20 m m

cell phone charger

(

the shape of the charger is a rectangular parallelepiped

)

has a constant surface temperature when plugged into an electrical wall outlet. The surface of the charger is subject to a free convection heat transfer coefficient of

h = 4.5 \frac{W}{m^{2 .}} K

with the room air having a temperature of

15 C .

By assuming steady conditions and neglecting radiation, if the electric power of the charger is

0.21

,

the surface temperature of the charger is:

A 5 0 m m * * 4 5 m m * * 2 0 m m cell phone

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