Relationship btwn watts/volts/amps contained by AC adaptor?

I my adaptor breaks, can I use an adaptor which uses the same voltage and polarity, but beside more/less amps/watts? For example, I have a broke adaptor which is 12v, 500mA, 23W. Can I use another which is 12v, 800mA, 17W on impossible to tell apart device?


Answers:    OK, the first two responders obviously want to play it locked. Safe is good.

Obviously you wouldnt want to nurture more voltage into something but just because the fresh adapter is rated 800mA of current doesn't suggest it is going "Force" 800mA into your device. If your device only desires to draw 500mA, that is adjectives it is going to draw. No harm done. Adapter will run a moment or two cooler than it would with an 800mA nouns and that seems apt to me.

Here is where you find into trouble. 98% of all the elder power adapters (and some of the new ones still) do not own a regulated output voltage! If it is rated 12v at 800mA, you will enjoy just that; 12v at 800mA nouns -but- if your load is smaller amount, the voltage will be higher, Now you enjoy a problem, the voltage may be high ample to damage the device.

Get a volt-meter and judge the output of the adapter without a nouns connected to it. If it is one of the older unregulated types, dont be surprised to see at tiniest 16v or more at the output. With only a 500mA nouns (on a 12v 800mA adapter), you may have 14 or 15v to your device. Will it blow up? depends on the device, some will stand it fine, some will run hot and eventually die.


If the adapter have a regulated output voltage, no problem as long as the amperage rating is equal to, or higher than, the power required by the device.
Don't use the other one, that might wound your device.
no, never substitute a device with a different specifications

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