Hi Lauren:


At the risk of being shown otherwise...

>   Determining the actual heat dissipation of your product could be very time
>   consuming. It would involve, in part, knowing the electrical efficiency of

I would argue that, using the law of conservation of
energy, this is not at all time consuming, and is really
quite easy.

The product takes in electrical energy.  All of this
energy must be accounted for in terms of dissipation 
of that energy -- in some form other than electrical
energy.  Most of the components are energy transducers --
they change the electrical energy into some other form
of energy.

Resistors, semiconductors, inductors, transformers, and
some capacitors all dissipate electrical energy in the
form of thermal energy.

LEDs and CRTs dissipate electrical energy into both 
thermal energy and light energy.

Motors transform electrical energy into both thermal 
energy and kinetic energy.  (The kinetic energy is 
then dissipated in friction which converts the kinetic 
energy to thermal energy.)

Charging a battery converts electrical energy to 
thermal energy and chemical energy.

The vast majority of the electrical energy is dissipated
as thermal energy.  


Best regards,
Rich




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