yes, if the other adapter is a va
No. The adaptor will overheat.
You can use any 9v adapter as long as the output amperage is rated higher than the amperage rating of your appliance so yes a 600ma adapter can be used to power a 500ma or 400ma appliance
No. There is a 50/50 chance it will work. Check the polarity on the label. Some adapters have the positive on the outside sleeve of the plug, others use the center portion. The device may be labeled, or use Google to locate the correct adapter for it. If you use a plug with the wrong polarity it might fry your device.
Yes, a 9v 1100mA power adapter work with your 9v 500mA device. The mA number is the maximum amount of amperage that the adapter will produce without overloading itself. At 500 mA the adapter will only be working at half load.
The capacity of the 800 mA adapter is 200 mA larger than the 600 mA adapter.
Yes, a 350mA capacity output will work well on a 210 mA load. This presumes that the old adapter worked well on the load that was connected to it. The load for the old adapter had to be below 210 mA.
No, the adapter's power output has to be equal to or greater that the current draw of the device.
No, the voltage is wrong. The device needs an adapter that only produces 5 volts. The device that you need may state on it 2500 mA instead of 2.4 amps
no, different voltage could fry solid state components.
No. Your portable radio needs 800mA to operate. Your adapter can only produce 400mA. If you make the connection the adapter will rapidly heat up and probably burn out.
No, if the device needs 700mA of current, your power adapter cannot supply adequate current.