Rookie said:

Can someone help me understand heat generation in electronic

components (IC's, caps, inductors etc)

I just can't seem to get a handle on the concept. Here is what I know:

power = V * I (this should work for anything?) - does this mean that

you can calculate the heat loss from any IC just by knowing its V and

I requirements? Or do we need to know the nitty gritty details of what

components are on the IC?

The only easy one for me is a simple resistor: P = V * I or P = I^2 *

R etc - this IS the heat dissipation for this component

I guess the question is if a circuit (IC or whatever) is being fed P =

V * I power, then does all this energy get dissipated as heat, by

definition? Electrical power in = heat out?

thanks much

confused...

That is all there is to it except for a couple details. The I and V

have to be DC to be measured as average values and then multiplied.

If AC, they have to be multiplied as instantaneous values and that

product averaged. This accounts for the energy storage of inductors

and returns to the driving source twice per cycle.

There is also an exception for things that convert electric energy to

some other form besides heat (like motors and lamps). If they were

100% efficient (which none are) then I*V would just measure their

energy output in some other form. As it is, I*V measures the power

entering them, and you have to have some other information to tell

what fraction of that power is not turning into heat, inside them.