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Is a 9v 1A adapter the same as a 9V 200mA adapter?

In: Consumer Electronics, Home Electricity [Edit categories]

Answer:

A 9V 1A adapter will supply up to 9 Watts of power and a 9V 200mA adapter delivers up to 1.8W of power. The 200mA adaptor may not be able to supply enough power to a device that has been supplied with a 1A adapter. The 1A adaptor should operate equipment that originally used a 200mA adapter.
Before using a different power supply, check that the outputs are both DC or both AC. If they are both DC, it is important to check that the polarity at the connector is the same for both. If AC and DC supplies are swapped or the polarity is swapped there is a risk that the equipment will be damaged.

First answer by GreenlightAV. Last edit by GreenlightAV. Contributor trust: 394 [recommend contributor ]. Question popularity: 8 [recommend question].

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