Not for very long. If the device actually requires 2A in order to do its job, then the adapter ... which is only designed to deliver 0.5A or less ... will get warm, then overheat, and then fail. Possibly in as little as a few seconds.
A 9v 1000ma adapter will operate a 9v 500ma device.
Yes! It will work well because your device needed only 300mA, but the adapter can afford until 500mA.
the excess 500mA will not be used, hence, it will not damage your device. Just make sure you have the proper voltages.
A device which requires 1000mA at 9 volts in order to operate will not work from an output of 500mA. This output is only half the power requirement of the device.
No, the 100mA adapter is too small. The adapter that can be used has to be at least 500mA or larger.
No there is not enough capacity in the 500 mA output device to operate a 1500 mA device.
No, the 12 volt adapter's output voltage is too high for a 9 volt device.
Yes, that will be safe.
The adapter's voltage must match that of the device, and its current-rating must exceed that of the device. So the answer is yes.
yes, if the other adapter is a va