External Power Adapter Question

  Fastflys 16:23 26 Mar 2009
Locked

I have a HP Compaq 6910p notebook/laptop? The external power adapter rated output is 19 Vdc 4.74 amps = 90 watts

My old notebook/laptop is a HP NC8000. The external power adapter rated output is 18.5 Vdc 3.5 amps = 64.75 watts

I would like to use my 6910p power adapter on both computers

Am I correct in thinking that you must match DC voltage, I.E. 19 v/18.5 v = Same but amps and watts don’t matter as my old NC8000 laptop uses less.

In other words although my 6910p power adapter can produce a maximum of 4.74 amps and 90 watts my NC8000 will only take/use 3.5 amps and 64.75 watts.

I don’t want to “blow up” my old NC8000 so can someone confirm that what I’ve said above is correct.

Thanks in advance
FF

  DieSse 17:12 26 Mar 2009

"In other words although my 6910p power adapter can produce a maximum of 4.74 amps and 90 watts my NC8000 will only take/use 3.5 amps and 64.75 watts."

Yes, that's quite correct.

18.5v does seem close enough to 19v that it would work (the basic input voltage is regulated and changed as required inside the laptop) - but I won't offer that as a guarantee that all will be OK.

Are the DC ends that go into the laptop the same physical size - often they are different.

  Fastflys 17:28 26 Mar 2009

Thanks for your quick response.

The DC male plugs are different sizes, the 6910p being 7mm in diameter approx and the NC8000 around 2mm. However I have a female to male adapter from HP which converts one size to the other.

Regards DC voltage: I have read [in a Dell document-I think?]that laptops etc., have a +/- tolerance of 1.0 Vdc so am happy now to take the chance.

FF

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