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09-16-2007, 06:00 PM
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#1
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Super Moderator
Join Date: Jan 1999
Location: Southern Oregon, Way West of Dimples ;)
Posts: 22,364
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Electrical question for Electricians
I know I have asked this before but I still need an answer
Laptop takes 19.5 vdc off the convertor to run
Convertor is rate @ 1.8 amps on 110
Is the formula for watts 1.8ax110v=198w? or does the converted voltage figure in
bottom line is a 350w inverter enough to safely run the laptop?
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When considering courage in battle, one should remember that there are 2 sides to every conflict.
The heroism of the losing side rarely gets remembered
but we were all husbands and fathers, sons and bros
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09-16-2007, 09:20 PM
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#2
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spaceman spiff
Join Date: Feb 2006
Location: south of Dimples
Posts: 8,469
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I'm no electrician, but I did suffer through a few electrical engineering classes.
I guess you're using a 350 Watt DC to AC converter, right? And your lappy converter will go from AC to DC. So essentially you're going from DC to AC to DC? Is that right? If so, the best bet would be to get a straight voltage converter, to go from whatever source you've got (probably 12V) to 19.5V.
BUT... I imagine you already have the inverter. As long as the output from the inverter matches the input for the converter (probably somewhere between 100-240V AC at 50-60hz), it should be fine. The wattage seems to be no problem.
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09-16-2007, 10:00 PM
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#3
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Good boy
Join Date: Jan 2000
Location: Marietta, GA, USA
Posts: 7,883
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Quote:
Originally Posted by Doug1
Is the formula for watts 1.8ax110v=198w?
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That is correct Doug. Assuming you're using the correct transformer for the computer you're good to go with a 350W inverter.
For future reference you can Google "Ohms law". In case you have trouble falling asleep some night. 
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09-16-2007, 11:30 PM
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#4
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Super Moderator
Join Date: Jan 1999
Location: Southern Oregon, Way West of Dimples ;)
Posts: 22,364
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Thanks Chris and Rick, i know that was one of the probs on GED test, i was just unsure if it changing 110 into 19.5 on the original power supply was an issue. ya converter takes wall current @ 1.8 a and converts it to 19.5vdc to power the lap top, the new inverter is 350 watt 110ac 
__________________
When considering courage in battle, one should remember that there are 2 sides to every conflict.
The heroism of the losing side rarely gets remembered
but we were all husbands and fathers, sons and bros
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09-16-2007, 11:50 PM
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#5
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Just some guy, you know?
Join Date: Sep 2005
Location: West of Dimples
Posts: 18,554
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But,.. If that 1.8Amps is at 19.5V then we have a whole other issue.
Normally the outgoing DC current is rated in Amps, and the incoming current is in watts,.. Can you confirm that the 1.8 Amps is being pulled from the wall?
Whiskey
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Life is never more fun, then when your the Underdog
Competing against the Giants.
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09-17-2007, 07:21 AM
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#6
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spaceman spiff
Join Date: Feb 2006
Location: south of Dimples
Posts: 8,469
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Nah, whiskey, I think the 1.8 amps is at 110VAC. If it's anything like my gateway power supply, which I'm looking at right now, the input is [100-240VAC, 1.8A, 50-60Hz] and the output is [19.5VDC, 3.42A].
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09-17-2007, 01:51 PM
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#7
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Moderator
Join Date: Nov 2004
Location: Montana
Posts: 5,490
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"Watts is Watts."
Wattage (power) is voltage * amperage regardless of AC or DC power. So yes a 350w inverter will give you what you need. Make sure to look at the constant output of the inverter, usually they are sold advertising the maximum peak output.
Ohm's law is cool.
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~Vince
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