joe wrote:
Art Unwin wrote:

Think about it Joe
If you had an equation for efficiency it would be dimensionless.

It depends upon how efficiency is measured. My more efficient car gets
30 MPG, My less efficient car gets 15 MPG. Any equation defining
efficiency in terms of miles per gallon does not have a dimensionless
result.

That isn't "efficiency", which is what is applies to antennas and it is
ALWAY a dimenionless number.

What you are talking about is "fuel efficiency", a different thing entirely.

The efficiency of a car is the useful energy output divided by the energy
in the fuel.

A modern gasoline automobile engine has an efficiency of around 35%, the
remaining 65% is mostly lost as heat in the exhaust.


--
Jim Pennino

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