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Author
sleepsleep

Joined: 05 Oct 2006
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sleepsleep
i got one problem. i got 2 adaptor,
1st adaptor = 19V ~ 4.24A
2nd adaptor = 19V ~ 3.42A

so, the question is, could i use adaptor A on laptop that accept 19V ~ 3.42A ?

thank you.
09 Sep 2009, 06:33
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17266
revolution
sleepsleep wrote:
so, the question is, could i use adaptor A on laptop that accept 19V ~ 3.42A ?
Yes. Current is drawn by a device, not forced into it by an adaptor, so no problem whatsoever.
09 Sep 2009, 06:42

Joined: 25 Sep 2003
Posts: 2141
Location: Estonia
You just have to assume that 1st means adaptor A
09 Sep 2009, 07:09
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17266
revolution
You just have to assume that 1st means adaptor A
Actually it doesn't matter which is A because both adapters can supply enough current. That is why I didn't even bother to ask.
09 Sep 2009, 07:51
Tomasz Grysztar
Assembly Artist

Joined: 16 Jun 2003
Posts: 7718
Location: Kraków, Poland
Tomasz Grysztar
But the adapter A could be some completely different adapter not listed here.
Like, if he used hexadecimal system to number the adapters, then he told us, what are the parameters of adapters 1 and 2, but not of the adapter A. Perhaps we could extrapolate?
09 Sep 2009, 08:38
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17266
revolution
Okay then, you guys win.

09 Sep 2009, 08:52
neville

Joined: 13 Jul 2008
Posts: 507
Location: New Zealand
neville
Of course there is also the question as to whether or not Adapters 1,2,3,...A have the matching type of connector to the laptop
And: laptops are often very sensitive to on-load voltage and will not run if the voltage is outside some very narrow limits such as +-0.05V (intended to ensure that only "genuine" adaptors can be used...)

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09 Sep 2009, 09:32
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17266
revolution
neville wrote:
And: laptops are often very sensitive to on-load voltage and will not run if the voltage is outside some very narrow limits such as +-0.05V (intended to ensure that only "genuine" adaptors can be used...)
Nonsense. No such thing. Maybe you forgot to put a smiley there?
09 Sep 2009, 09:55
shoorick

Joined: 25 Feb 2005
Posts: 1605
Location: Ukraine
shoorick
Quote:
laptop that accept 19V ~ 3.42A

means, that laptop will work with adaptor which has 19V output and its maximum load >= 3.42A
09 Sep 2009, 10:01
sleepsleep

Joined: 05 Oct 2006
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sleepsleep
Quote:

Actually it doesn't matter which is A because both adapters can supply enough current.

ok, so adaptor 1st = 19V ~ 4.24A
2nd adaptor = 19V ~ 3.42A.

the problem is, the laptop original adaptor is 19V ~ 3.42A, but i found a same adaptor with same hole but output (19V ~ 4.24A)

i was worried if more amps could kill the laptop in long term.
coz i am putting more 0.82A into the laptop....

i tried already, the laptop could be turned on, but i am worried in long run. possibly damage the laptop???? anyone could confirm.

Quote:

But the adapter A could be some completely different adapter not listed here. Wink
Like, if he used hexadecimal system to number the adapters, then he told us, what are the parameters of adapters 1 and 2, but not of the adapter A. Wink Perhaps we could extrapolate?

hehehe
09 Sep 2009, 10:49
revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17266
revolution
sleepsleep, the current rating is the maximum available supply. If the laptop won't take the maximum then that causes absolutely no harm whatsoever. Check out Ohm's Law.

Going the other way though might not work. A heavier use laptop on a lighter capable adapter would probably not be 100% good. Although it could work in most cases just that any really heavy usage, like when you are charging and also running the CPU at 100% at the same time, then you might find the adapter will just turn off due to overload.
09 Sep 2009, 10:55
shoorick

Joined: 25 Feb 2005
Posts: 1605
Location: Ukraine
shoorick
voltage depends on adaptor, current depends on laptop
Quote:

1st adaptor = 19V ~ 4.24A

means: this adaptor may output 19V and current in range from 0 till 4.24A. bigger current may cause damage of adaptor or decreasing voltage.
these all numbers say: you may not use with your notebook any adapter with voltage not 19V and current less then 3.42A

my wall outlet has 220V and, say, 10A (as autoswitch lets). how do you think, if i have a lamp 220V 22W (22W/220V=0.1A) - will it be damaged if i will plug it to this outlet?
09 Sep 2009, 11:00

Joined: 25 Sep 2003
Posts: 2141
Location: Estonia
Rule of thumb!
1) Voltage MUST be the same (though it can fluctuate ±10% easily)
2) Amperage - the bigger, the better*

*but bigger amperage means that you're not using it at its optimal consumption level (but that usually doesn't mean anything)
Skim through this if you like

Lower amperage ...ah, heck, lets make an example:
- Your laptop needs (hungers) 2A (amps)

What will happen:
X works fine with your laptop
Y not so fine
What might happen:
1a) Y will 'play' with your laptop, but not charge
1b) Y will 'play' and charge, but charging takes like a gazillion years

PS. Mozilla's spell-check allowed 'gazillion'-usage
09 Sep 2009, 12:19
sleepsleep

Joined: 05 Oct 2006
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sleepsleep
ic, i think i get it now.

so, rule of thumb, it is 19V so no problem.
another thing, required is 3.42, but i provide 4.42, so, working fine, wouldn't explode the laptop in long term!! hehehehe.
09 Sep 2009, 12:47
Alphonso

Joined: 16 Jan 2007
Posts: 294
Alphonso
shoorick wrote:
my wall outlet has 220V and, say, 10A (as autoswitch lets). how do you think, if i have a lamp 220V 22W (22W/220V=0.1A) - will it be damaged if i will plug it to this outlet?
Possibly, if the lamp comes with a cable it is likely that the cable will not be rated for 10A and perhaps it's not fused either. Since the lamp is only 22W maybe they use a 1A cable. Something causes a short but because the short draws 10A through the resistance of the short and cable the breaker does not trip and the cheap cable is subjected to a part of ~2KW of power and bursts into flame burning the house down.

Having too much current can be a problem if a fault occurs but don't worry too much sleepsleep, the difference in your case is not that great
09 Sep 2009, 15:44
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