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oprfot

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## Homework Statement

i've been asked to compare the efficiency of a photo voltaic cell and a solar heating cell (an array of pipes). both will be exposed to a 150W bulb for an equal amount of time.

## Homework Equations

for photo cell: P=IV

for heating panel: P=fcT f=flow rate c=specific heat capacity T=change in temp

## The Attempt at a Solution

im trying to say that both will have the same surface area exposed to the light, i was just wondering what measurement to use for the pipes: the surface area of the pipes that is exposed, or the area of the whole panel??

any other suggestions would be welcome :D