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Re: What sets the charging rate?

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On 27/11/2018 23.43, Tim wrote:
> "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> wrote in
> news:zUesCwyzPX$bFw5D@255soft.uk: 
> 
>> In message <35pucf-i3d.ln1@Telcontar.valinor>, Carlos E.R. 
>> <robin_listas@es.invalid> writes:
>>> On 26/11/2018 17.52, J. P. Gilliver (John) wrote:
>>>> In message <pth9uf.bag.1@ID-201911.user.individual.net>, Frank
>>>> Slootweg <this@ddress.is.invalid> writes:
>>>>> Tim <onelydad58@gmail.com> wrote:
>>>>>> nospam <nospam@nospam.invalid> wrote in
>>>>>> news:261120180852212967%nospam@nospam.invalid:
>>>>>>
>>>>>>> In article <XnsA9A6336EF683timothybilyahoocom@69.16.179.28>, Tim
>>>>>>> <onelydad58@gmail.com> wrote:
>>>> []
>>>>>>>> But the USB 3 ports on my computer provide 1.5A, so why doesn't
>>>>>>>> it charge at that rate rather than .5A?
>>>>
>>>> (Same reason your 40 watt light bulb doesn't draw the kilowatt or so
>>>> your household lighting circuit can supply.)
>>>
>>> Well, not exactly: the light bulb doesn't have a controller, and it
>>> doesn't negotiate. It is purely ohm law, with a relatively fixed plain
>>> resistor (except that the resistor gets so hot, that resistance
>>> increases notably with the temperature).
>>>
>>> So the house supplies a fixed voltage and you connect a fixed
>>> resistor: the current is determined from both. There is no limitation
>>> in the circuit on current or power: but if the resistor is too low,
>>> the fuse blows. 
>>>
>>> Intelligent devices can have batteries with regulation. The apparent
>>> resistance the "battery" has varies so that it draws more or less
>>> current as needed.
>>>
>> I know, it was a poor example: I was just a bit shocked that someone 
>> could say "my charger delivers 1.5A"; he didn't realise that the truth
>> was that his charger _can_ deliver 1.5A, but doesn't necessarily do so
>> if the device doesn't suck that much. I suppose I could have said
>> "your charger doesn't deliver _anything_ if nothing is connected to
>> it", but that wasn't as good, I thought.
>>
> You are missing the point. My point was, the charger was capable of 
> delivering 1.5A, and the question was why isn't the device doing so. 

Because the load doesn't draw that much current :-)

-- 
Cheers, Carlos.

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Thread

What sets the charging rate? Tim <onelydad58@gmail.com> - 2018-11-23 22:52 +0000
  Re: What sets the charging rate? Tim <onelydad58@gmail.com> - 2018-11-24 04:24 +0000
    Re: What sets the charging rate? micky <NONONOmisc07@bigfoot.com> - 2018-11-25 00:10 -0500
      Re: What sets the charging rate? "Carlos E.R." <robin_listas@es.invalid> - 2018-11-25 14:12 +0100
        Re: What sets the charging rate? micky <NONONOmisc07@bigfoot.com> - 2018-11-25 21:22 -0500
          Re: What sets the charging rate? "Carlos E.R." <robin_listas@es.invalid> - 2018-11-26 15:21 +0100
            Re: What sets the charging rate? micky <NONONOmisc07@bigfoot.com> - 2018-11-27 03:52 -0500
    Re: What sets the charging rate? nospam <nospam@nospam.invalid> - 2018-11-25 00:42 -0500
      Re: What sets the charging rate? Tim <onelydad58@gmail.com> - 2018-11-26 06:18 +0000
        Re: What sets the charging rate? nospam <nospam@nospam.invalid> - 2018-11-26 08:52 -0500
          Re: What sets the charging rate? Tim <onelydad58@gmail.com> - 2018-11-26 14:03 +0000
            Re: What sets the charging rate? nospam <nospam@nospam.invalid> - 2018-11-26 09:11 -0500
              Re: What sets the charging rate? Tim <onelydad58@gmail.com> - 2018-11-26 15:45 +0000
                Re: What sets the charging rate? nospam <nospam@nospam.invalid> - 2018-11-26 10:49 -0500
            Re: What sets the charging rate? Frank Slootweg <this@ddress.is.invalid> - 2018-11-26 16:19 +0000
              Re: What sets the charging rate? 123456789 <12345@12345.com> - 2018-11-26 09:33 -0700
                Re: What sets the charging rate? nospam <nospam@nospam.invalid> - 2018-11-26 11:57 -0500
              Re: What sets the charging rate? "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-26 16:52 +0000
                Re: What sets the charging rate? nospam <nospam@nospam.invalid> - 2018-11-26 11:57 -0500
                Re: What sets the charging rate? Frank Slootweg <this@ddress.is.invalid> - 2018-11-26 18:49 +0000
                Re: What sets the charging rate? "Carlos E.R." <robin_listas@es.invalid> - 2018-11-27 04:09 +0100
                Re: What sets the charging rate? "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-27 16:42 +0000
                Re: What sets the charging rate? Tim <onelydad58@gmail.com> - 2018-11-27 22:43 +0000
                Re: What sets the charging rate? "Carlos E.R." <robin_listas@es.invalid> - 2018-11-28 14:08 +0100
                Re: What sets the charging rate? Andy Burns <usenet@andyburns.uk> - 2018-11-28 13:27 +0000
                Re: What sets the charging rate? "Carlos E.R." <robin_listas@es.invalid> - 2018-11-28 14:06 +0100

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