How computers use energy from a battery

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Guest

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Hello,

I was just wandering how a computer uses power.

From my understanding, the current changes depending on the workload. When resistance is a constant value the current is directly related to the voltage.

So as workloads change does voltage?
When a battery reaches certain discharge percentages do the voltages lower?
and what does this mean for the performance of the computer with lower voltages?

Thanks ahead for the help. Any and all is appreciated!
 
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hang-the-9


That is not how batteries work, just because you used up half the battery power does not mean the voltage it sends to the system will lower. If your car is at 50% of gas, does it drive slower? It will drive at the same speed till it's at 0, it will just hit 0 faster the faster you drive, same for a laptop battery. Now the computer can go to low power mode to save the battery life, but that does not come from the battery side. Sure at some...
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G

Guest

Guest


Thanks for the quick responses.

Lets say my battery discharges to 50%, and the volts lower.
However I need a constant frequency of my hardware at full load to game.

What if the volts can no longer satisfy the amount of power, I need to feed to my hardware?
Will they automatically downclock ?
what will happen?



 
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13thmonkey

13thmonkey

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Jan 10, 2006
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the battery supplies typically 12V, the mobo's voltage regulation turns that down to 1.15 volts (or whatever your CPU needs at that moment in time), this is independent of the battery voltage drooping, so if the battery dropped to 11.5 then you'd still get 1.15 at the CPU.
This is a vast oversimplification but broadly correct.
 
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G

Guest

Guest


Thank you very much.

Do the full on 12V ever get used at 100% usage?
And what else besides the the CPU uses power from that rail?
 
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hang-the-9

hang-the-9

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Mar 25, 2010
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That is not how batteries work, just because you used up half the battery power does not mean the voltage it sends to the system will lower. If your car is at 50% of gas, does it drive slower? It will drive at the same speed till it's at 0, it will just hit 0 faster the faster you drive, same for a laptop battery. Now the computer can go to low power mode to save the battery life, but that does not come from the battery side. Sure at some point the charge in the battery is not enough to power the system, that's when the computer automatically goes to sleep/hibernate mode.
 
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