input voltage is strictly according to applications. If use 12V dc adapter power 5V dc device, the 5v dc device would be damaged.
No
Yes it will
It is generally safe to run a 4.3V device with a 5V power adapter, as the device should only draw the amount of voltage it is designed for. However, there is a slight risk of damaging the device if the voltage is consistently higher than the recommended level.
No, underpowering will not "power" the device, it will not run. You must get an adapter that is 6V and (2A or higher) will be ok as well.
yes, depends on equipment..
Well, trying to clarify your question, if you have a device that normally has a 5V 3.6A adapter, than it likely needs to be able to draw up to 3.6 amps or so for the device to operate normally. So, a 5V 2.6 amp adapter may operate at times, but only when the device is trying to draw less than 2.6 amps. If the device tries to draw more than 2.6 amps than you run the chance of burning out your transformer (the AC adapter), or just not having your device work. Both adapters will put out the 5 volts, but the 2.6 amp adapter will not provide enough current. You can safely use a larger adapter than the 3.6A, as your device will only draw as much current at 5 volts as it needs. On another note, do not try an adapter that puts out the same current but more voltage. Such as 7.5 volts 3.6 amps. This will overdrive your device and potentially burn it out.
+12V, -12V, +5V, -5V, +3.3V +12V, -12V, +5V, -5V, +3.3V
+12V, -12V, +5V, -5V, +3.3V
Absolutely. The first rule: Source voltage should be equal to the device voltage. The second rule: Source current sould be higher than the cumulative of the device's current.
-12v+12v+5v+3.3v
12v, 3.3v 5v
+3.3v +5v -5v +12v -12v