What exactly are amperes anyway?
March 14, 2011 1:53 PM Subscribe
If I use a 19.5 volt 4.7 ampere adaptor with a device that calls for a 19.5 volt 3 ampere adaptor, will it cause any problems?
your laptop will be fine but (as on preview already suggested) ensure polarity is correct (usually depicted with 2 concentric circles with a '+' attached to one of them.... likely the middle one)
posted by chasles at 2:06 PM on March 14, 2011
posted by chasles at 2:06 PM on March 14, 2011
Not a problem. 4.7A is the limit of what it can put out, which means it is capable of supplying the required 3A. It's like having a car that can do 200mph - it won't have a problem driving 60mph on the highway.
As others have said, the polarity (arrangement of the positive and negative terminals) must match what is required as that would be a big problem if it were reversed.
posted by Diplodocus at 2:19 PM on March 14, 2011
As others have said, the polarity (arrangement of the positive and negative terminals) must match what is required as that would be a big problem if it were reversed.
posted by Diplodocus at 2:19 PM on March 14, 2011
Response by poster: To clarify, both adaptors are for Sony laptops
posted by matkline at 2:39 PM on March 14, 2011
posted by matkline at 2:39 PM on March 14, 2011
Generally speaking, the voltage has to be the same and the current rating of the supply has to equal or exceed the current rating of the load.
posted by Chocolate Pickle at 3:33 PM on March 14, 2011 [1 favorite]
posted by Chocolate Pickle at 3:33 PM on March 14, 2011 [1 favorite]
horsepower is probably a better analogy than mph, but yeah you'll be fine.
posted by russm at 3:34 PM on March 14, 2011
posted by russm at 3:34 PM on March 14, 2011
russm: "horsepower is probably a better analogy than mph, but yeah you'll be fine"
Horsepower is a terrible analogy notwithstanding the confusion with electrical power. Think of it as a pipe supplying a tap - if you need a certain flowrate, as long as the pipe is wide enough (the supply is rated to at least the necessary current), it can provide the required flowrate.
posted by turkeyphant at 6:27 AM on March 15, 2011
Horsepower is a terrible analogy notwithstanding the confusion with electrical power. Think of it as a pipe supplying a tap - if you need a certain flowrate, as long as the pipe is wide enough (the supply is rated to at least the necessary current), it can provide the required flowrate.
posted by turkeyphant at 6:27 AM on March 15, 2011
This thread is closed to new comments.
posted by kcm at 2:03 PM on March 14, 2011