Yes. The voltage is the same on each. The ma rating of the power supply is the current the supply can handle before burning up. So if your appliance is designed to work on an 800ma supply, an 850ma supply will do fine.
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Yes you can. But it may damage your computers power supply.
all about regulated power supply
If it is a computer power supply it is the box that gives the computer its power from the outlet.
In an ideal DC power supply, there is no ripple.
conclusion of dc power supply 9V