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## Homework Statement

Hi, I am trying to work out the energy needed to move a certain quantity of (ideal) gas using a fan but am finding a great discrepancy between my calculations and those supplied by the fan manufacturers.

let's say i'd like to move 1kg of air (1kg/m3) a distance of 1m. I get the energy required fs to be 10Joules. The fan manufacturers are saying that their fan to do this is 145W. I get that fans aren't 100% efficient but still, 145J to do 10J work? I'm sure i'm missing something!

Thanks!

## Homework Equations

e=fs

## The Attempt at a Solution

e=fs,

e=(1kg x 10ms-1) x 1m

e=10J