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[_iffy]

amps is current.  ie: how many electrons are shot through your wires.
Volts is charge. ie: how intense each electron is.
watts is power ie: volts x amps.

for too much volts...
Think of it like passing a marble through a garden hose. It is small enough, and it falls through no problem. Then force a baseball through it. Somethings going to break.

for too much amps...
Think of it like a highway. It's only big enough for so many cars. During rush hour, and heavy traffic, there are too many cars on the road. Someone will get into an accedent, and hit a gaurd rail. Once a twenty car pile up happens, the police close the road, and no one gets through.



If you let too much volts through your wires they will melt. If you put too much amps through your wires they will melt.

Keep looking and find the right adapter.

[Perplexer]

Well, I think your 19V 4.74A adapter will work fine.

You will be supplying 19V when the laptop probably expects 20V.  This probably won't be an issue; it might just take a tad longer to charge your battery.

And you've got enough amperage; the laptop will only pull 4.5A or what is necessary.  Your power supply can handle up to 4.74A, so that part is fine.

But don't blame me if anything breaks

[throwingks]

I agree with perplexer. Most components are made to take a little variance in voltage and amperage anyway. Physically check any PSU and you will see they are not perfect. You dont want to chance it on anything worth a lot of money though.

Technically, _iffy is right and you would be better off going with the proper adapter. Those specs shouldn't be too hard to find.

[BCfosheezy]

QUOTE(_iffy @ Sep 30 2006, 09:16 AM)

amps is current. ie: how many electrons are shot through your wires.
Volts is charge. ie: how intense each electron is.
watts is power ie: volts x amps.

for too much volts...
Think of it like passing a marble through a garden hose. It is small enough, and it falls through no problem. Then force a baseball through it. Somethings going to break.

for too much amps...
Think of it like a highway. It's only big enough for so many cars. During rush hour, and heavy traffic, there are too many cars on the road. Someone will get into an accedent, and hit a gaurd rail. Once a twenty car pile up happens, the police close the road, and no one gets through.



If you let too much volts through your wires they will melt. If you put too much amps through your wires they will melt.

Keep looking and find the right adapter.

 

Some things you were right on. Unfortunately not all. You could, in theory put 100,000 volts through a 24awg wire but the current rating remains the same. Voltage is known as EMF. Electro-motive force. It is the force driving the electrons. This is why there are current ratings on fuses instead of voltage AND current ratings.

 

On the flip side of the coin Voltage is from the power source. The amount of current is drawn. So this guy could have a 400 amp power supply as long as the voltage is correct and it would be just fine as the laptop would only draw the current it needs. The amount of current drawn is directly proportional to the voltage. If the voltage drops, the current drawn will also drop.

 

Bottom line, you will only melt a wire if too much current is drawn through it.

 

[thepissedoffman]

When dealing with power adaptors you need to have the same voltage as what is required and atleast the amount of amps that is required. You sometimes can get lucky and get away with a lower voltage adaptor but never assume it will work.

So with your laptop that needs a 20v 4.5a adaptor get one with 20v (not higher or lower) and with 4.5a or more (can't go below 4.5a).