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Any Electrical Engineers? Laptop inquiries

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Old 09-06-2006, 05:01 PM
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Default Any Electrical Engineers? Laptop inquiries

Tried googling.. but being up at the cottage.. the internet has become the interWAIT on 1X wireless dial up.

Basically.. I want to know wat wattage it would be from a 12V source to run something at 19V @ 3.46 Amps ( not including resistance and power loss etc.. )
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Old 09-06-2006, 05:26 PM
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3.46 amps at 19V gives you 65.74 watts.
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Old 09-06-2006, 05:37 PM
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And 5.48 amps at 12V
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Old 09-06-2006, 06:32 PM
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Amps (A) 3.46 x Voltage (V or E) 19=65.75 Watts (W)

Sounds like your trying to run a laptop
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Old 09-06-2006, 06:34 PM
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Oh, DC Voltage x current (amps) = Power (watts)
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Old 09-06-2006, 06:36 PM
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so how much wattage at 12V would it take to equal 19V @ 65.75
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Old 09-06-2006, 06:37 PM
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You really can't make 12 volts = 19 volts. You need a converter (DC-DC)
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Old 09-06-2006, 06:41 PM
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Yes its running a laptop.. Long story short.. just wondering how much wattage/amperage it would draw on the car and or on the generator ( at the cottage ) to run the laptop..
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Old 09-06-2006, 06:42 PM
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The voltage "pushes" the amps or current. You have to have some way of coming up with the 19 volts first
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Old 09-06-2006, 06:45 PM
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If you are plugging your laptop into the car with a convertor, it will pull the same wattage.
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