The voltage would match but the amount of power would likely not be enough to run the device. Under-power will not likely harm the device, but it won't work correctly.
Always use the correct voltage/power for your devices!
Yes.
The device only draws 100mA and the supply is capable of supplying 200mA.
Electronic devices only draw as much current as they need.
As long as the power supply can cope, it will be alright.
A 200mA supply will only be runnning at half capacity and should be able to handle it without running too hot, or failing.
The answer to your question is maybe. First you need to find out wether your device uses DC (direct current) or AC (alternating current). On the device specs or somewhere on the device where is says the input voltage it will say either ac or dc it may be right after it states the volts for instance 9V DC, 9VDC, 9V AC, or 9VAC. Obviously the dc standing for direct current and the ac standing for alternating current. Now if it doesn't say ac or dc it may have a symbol representing it. Also check that link even if it does state it and read the section titled polarity and confirm that both power supplies have the same polarity. Now if you have confirmed that they both use DC power and they both have the same polarity you can use that adapter on the device, however take into account that the adapter outputs 300ma instead of 400ma that the device requires. As a result you may not be able to run the device at full capacity and it may power down briefly when a large load is introduced. If this occurs buy the proper adapter or if you like playing with electricity like me (even when its not practical) you can wire in a properly rated capacitor in series with the positive conductor. Take into account that installing a capacitor is not worth the time or money its just fun.
Yes, the 400mA refers to the maximum current the device needs, the power supply can deliver 500mA so it won't have it's maximum current output exceeded.
generally yes, it can deliver 300mA, the device only requires 200mA
No. The adaptor will overheat.
No, the adapter's power output has to be equal to or greater that the current draw of the device.
The name tells you - it supplies power to the device it is part of.
A Battery.
it converts AC line voltage to DC low voltage. at first by transformer it setps-down the voltage then it rectified by bridge rectifier ckt. by this there is rippled DC output is there. then is this fed to filter circuit to filter the ripples and its given to regulator circuit to produce fine and smooth pure DC voltage. nowady SMPS (switch mode power supply) is use rather then older iron core transformers. SMPS have plenty of advantages over the Linear power adaptor. :))
To trouble shoot a device the problem with the device has to be stated. With a UPS the first thing to check is the batteries.
No. The device will try to draw 700 milliamps which will overload the 300 milliamp adapter most likely causing it to burn out and possibly catch fire.
No, the adapter's power output has to be equal to or greater that the current draw of the device.
No. The voltage rating is the same, but the lower current rating on the 400ma power supply might cause the voltage to drop way below 12 volts, and on some devices a lower voltage than it is rated for will cause it damage.
No, a power adapter must supply the same voltage, same polarity, and at least as much current as the load requires. Your adapter can only supply 300mA, which is less than the 700mA required by the load.Your game probably will not turn on and the power adapter may be damaged.
No you can not. The power supply output of 5 volts is under sized. There is no way that a 45 volt device would operate from it. You will need to find a power supply of 45 volts.
I think you mean to ask if one can use a 9v 600mA adapter to power a 9v 300mA appliance. Yes, you can do that. A 9v 600mA adapter will deliver 9v at up to 600mA. A mA is one milli amp, or one thousandth of an amp. 300mA is 300 thousandth of an amp, 300/1000 or 0.3 amps. 600mA is 600 thousandth of an amp, 600/1000 or 0.6 amps, and is twice the current of 300mA.
Most probably you are using a AC (117V or 220V) to DC 6V converter adapter. If yes, then the answer is no, you cannot use a lower current rating for a device that draws more current. If you plug in a device that needs DC 6V 500 mA to an adapter that can only supply DC 6V 300mA, then the adapter could start sending higher than 6 volts current which may damage your equipment or overheat the adapter. If you are using a higher mA rating adapter, then it's okay. For more technical details, see: http://www.jaycar.com.au/images_uploaded/plugpack.pdf
A: Disregarding the fact of different voltages there is the power to be concerned 9v x 1A = 9W, 15V X .8 = 12W. THE DEVICE WILL BE UNDER POWER.
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
2-volt batterys I need the charger for this 20 million CP light
No, if the device needs 700mA of current, your power adapter cannot supply adequate current.
input voltage is strictly according to applications. If use 12V dc adapter power 5V dc device, the 5v dc device would be damaged.