Confusion about batteries?

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Bruce Hugo

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Sep 2, 2013
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Hoping for help with my calculations.
So my tablet has a 10 hour battery life.

With the info in this link...

http://www.batterymart.com/p-tlp-020-amazon-kindle-fire-hdx7-battery.html?utm_source=google&utm_medium=cpc&utm_term=TLP-020&utm_campaign=PLA&gclid=Cj0KEQjwquOhBRCupYiu4an13scBEiQAss2Xkp5Hh28NGR_2B-1zgurjgXHwW_EfLeE2HIyCqa9lL38aAmjt8P8HAQ

and using this formula...

http://www.rapidtables.com/convert/electric/mah-to-wh.htm

I get 3.7*4550/1000= about 16.8 watt hours
then using this formula...

http://www.rapidtables.com/convert/electric/wh-to-watt.htm

16.8/10 hour battery life = 1.68 watts

my psu is rated 650 watts, which would mean my desktop uses 500X as much power as my tablet?

What is my error?

Thanks in advance.
 
Solution
I
That runs on battery? As you can see, an ordinary PC will chew through juice. Laptops have low power cpu's an gpu's in them to be able to have good battery run time.

For a mobile desktop, you need to tote a car battery or use low power components. Which means not so high performance.
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huilun02

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Feb 29, 2008
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You are trying to compare the power usage of your desktop vs. your tablet? Why?

The idle/average/load power usage of your desktop varies greatly depending on the components in it.

Your PSU rating is only a rough guage of the max power it can provide for your PC. It does not mean it is using 650W all the time.
 
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Bruce Hugo

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Sep 2, 2013
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To test the math, which was vastly different than I would have thought. I was actually in the middle of attempting to look into a mobile desktop.
 
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i7Baby

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Jul 25, 2012
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That runs on battery? As you can see, an ordinary PC will chew through juice. Laptops have low power cpu's an gpu's in them to be able to have good battery run time.

For a mobile desktop, you need to tote a car battery or use low power components. Which means not so high performance.
 
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