Mohamed Ismail Bari wrote:
> Hello guys,
>
> I need a very basic clarification here.
>
> Lets say a resistor of 1Ohm has 1Amp DC current through it. So, the power
> dissipated in the resistor is 1W. I want to know how this power can be
> releated to time. Should I say the dissipation as 1W/Sec or 1W/min or
> 1W/Hr?????.... (My guess is 1W/Sec) I am sure this is a 7th grade math.
> Probably, I was not paying attention when I was in 7th grade..;-).
>
> On the similar lines.. How do we measure the power consumed by a
> fast varying load (For ex: Switching currents in a IC).. Area under the
> current waveform? Any other methods?
>
> Thanks,
> Ismail
>   
Power is not related to time, that's why you're confused about how you 
should relate it to time. It's just "1 Watt, instantaneously" - measure 
it again and it could be "1 Watt, at this next instant of time"

I think you're saying for the second question that you want to want to 
measure the average power? Just take the average current and use I^2*R 
or average voltage and current and use V*I. Most SPICE simulators can 
give you this value one way or another.

--
Martin K
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