Can I Use 12v Adapter For 5v. Could I use a 12v 15A adapter with a 12v 3A device. Actually you might be surprised how long it.
You could for a while until the overloaded adapter goes up in smoke. Most equipment is designed for a nominal voltage - say 12V for automobiles - but there is a tolerance. One thing to note is the DC voltage on the 12v side can actually vary from 15v coolcold battery in absorb charging cycle.
If you are a cautious person then you should use a manufacturer recommended power adapter.
I have 5V AC adapter with USB connection on one side and the two plugs for the AC outlet on the other. Most wall adaptors are not regulated this means that the voltage they produce varies with load. My appliance Small fan says it needs 3V AC adapter. Also an adaptor of voltage higher than the device needed would damage your device.
