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It depend on what the load of the device that plugs into it is. The mA rating is the maximum amount of amperage that the adapter can produce. The 500 mA adapter will produce about a half amp whereas the 1200 mA adapter outputs 1.2 amps. So one is about three times larger that the other. Check the device that you are trying to power for a mA load and that will tell you whether you can use it on the 500 mA adapter.
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Can you use a 12 VDC 2A adaptor on a 12 VDC 1A device?
Yes, there will be no problem with this adapter. The 1 amp device will only be drawing half of what the adapter can produce.
Can you replace 12v vdc adapter by 12v vac adapter?
No, 12 volt AC is a different from 12 volt DC. Have a second look at the 12 AC volt adapter's output label. Most adapters contain a bridge rectifier in them that makes a conversion within the adapter. An example of this is in phone chargers.
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The coil will burn out due to having almost double the voltage being applied to it.
Can you use a 15 V DC 500 mA power supply on a device that originally required a 12 V DC 1 A one?
No and no. The voltage used should match what the original equipment manufacturer recommends, so 15 VDC will be too high. The amperage of 1 amp that the device needs is equal to 1000 mA. You can see that the adapter that you were asking about only has half the amperage capacity that is needed to operate the 12 VDC device.
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