Can i use a 75watt for a 65watt laptop

December 15, 2010 at 13:16:21
Specs: Windows Vista
I have a 75watt ac adapter and want to use it on my acer aspire that uses a 65 watt ac adapter. Would this be safe?

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December 15, 2010 at 14:00:10
Yes it will be safe. You can never have too many watts. The thing to be wary of if Volts. Too many of them and the smoke escapes.

Watts is a measurement of power. It is like saying my motors car is 100 Horsepower. Is it to powerful to drive down a country lane. Only if you press to hard on the accelerator. The laptop will sets its own level as far a power is concerned, it will take what it needs.

The Volts required is usually very specific. That should be a near as possible exactly what the specifications call for.

You also need to be looking at the Amps the power supply can supply as well as the Amps the laptop needs.

Watts = Volts * Amps


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December 15, 2010 at 14:20:12
Thank you for that information. Very helpful . However i have another question. Does the Amps have to be exact? I noticed the V are the same but the A are not.

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December 15, 2010 at 14:36:15
The Amps that the power supply provides needs to be the same or greater than the laptop needs. If it is greater then the bit about power above applies.

If it is less then the power supply will struggle to provide the necessary power and will overheat.

However as the power supply is rated above what is needed and the Volts are right then the chances are the Amps are as well.

Amps = Watts/Volts


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Related Solutions

December 15, 2010 at 16:54:13
If the 75 watt adapter is not designed for that laptop you will need to make sure the polarity (+/- orientation) is the same as the 65 watt adapter.

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December 15, 2010 at 16:58:09
To be rather honest you can't expect it to be "safe" unless more is known. To be sure one would have to know if in fact it is regulated. If it were not and many are not then it could pose a problem.

Testing a known working proper one with and without loads would provide a technician a reasonable clue as to it's function. Then test the subject one.

I doubt you would have an issue but in the most strict sense of safety you should only replace with what the manufacturer recommends.

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December 15, 2010 at 19:19:56
Thank you everyone for all your help. My questions have been answered.

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