I know this forum is well advanced for the question I have so be kind :)
I have always saved DC adapters from all my electronics and often reuse them in other devices. However today is the first time i've decided to try and learn what the significance of the volts and amps are. i usually just look for an exact match for instance 9V 1.2A + polarity etc.. but ive noticed that sometimes I can use an adapter with smaller voltage than the device specifies and it still works.
So based on my very rudimentary lesson on this today i'm now aware that the volts and amps combine to produce the power output the device needs. But can someone tell me if I have this understanding correct... lets say I have a device that requires an adaptor that is 12V .2A. Based on the formula of P = VI, wouldnt that mean that I could also use an adapter that was 6V .4A?? since both provide 2.4 watts of power??
Thanks in advance