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About Dave Nyce
Expertise
I have been an electronics engineer for 25 years. I can answer questions on analog and digital circuits and my specialty is sensors.

Experience
I am the inventor on 23 US patents, and also some foreign ones. Developed sensors for over 25 years. Licensed private pilot (airplane and rotorcraft), have HAM radio license. I'm not an expert in computer networking.
 
   

You are here:  Experts > Computing/Technology > Job Searching: Technical > Electrical Engineering > Voltage and Current - Basic Question

Electrical Engineering - Voltage and Current - Basic Question


Expert: Dave Nyce - 1/2/2003

Question
Hi Dave and thanks for taking the time to answer my question.   

The power socket on my laptop computer is expecting 16v 2.5A.  I have a car/auto adapter which delivers 16v 3.8A.   

Between the displayed voltage and ampage ratings on the computer is a steady line with a dashed line underneath.

My question is, is this adapter okay for the computer or is it delivering too much Amps ?   

Thanks again for your time.    

Regards   
Adam

Answer
"Delivering too much amps" is not a problem. The 3.8A rating of the power supply means that it is capable to deliver any current up to a maximum of 3.8A.

The laptop computer rating means that it will draw current up to a maximum of 2.5A. So, everything looks ok for this use, since the current requirement of the computer is within the capability of the power supply. The only current that will flow from the power supply is that which is drawn by the computer.

You can also hook something else up to the same power supply, in addition to the computer, as long as it does not need more than 1.3A (which is 3.8A - 2.5A).  

Hope this helps!

Dave

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