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Re: Interesting question

In Response To: Re: Interesting question ()

: For a quartz watch, I guess you could figure
: that a battery lasts four years, so a
: typical quartz watch would consume in one
: day 1/1460th of whatever the total
: electrical capacity of the battery is.

Ok well to take it one step further. Looking at:

http://www.gpbatteries.com.hk/Consumer/Specialty/Watch/Watch.asp

Gives a list of capacities for common watch batteries. 50 mAh seems to be in the middle. So 4 years is: ~35063 hours. Therefor 50mAh/35063h = 1.47 uA.

Ok, so Power=Current*Volts, so Silver Oxide is 1.55V, so 1.47A*1.55V = 2.21 uW. Since a watt = joules/second, and we all know there's 86400 seconds/day, therefor in 1 day a watch uses 2.21uW * 86400s = 191mJ.

-Andrew

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Interesting question

Re: Interesting question

REAL wristwatches don't consume _any_ electricity.

Re: Interesting question

Great analysis, Andrew! *NM*

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0 wallclock secs ( 0.17 usr + 0.02 sys = 0.19 CPU)