About How many mA should I choose for outdoor power supply
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6 FAQs about [How many mA should I choose for outdoor power supply]
What is the minimum load requirement for a power supply?
Some power supplies, generally older switchers, have a minimum load requirement. This is usually 10% of full rated output current. For example, a 12 volt 2 amp supply with a minimum load requirement of 10% isn't guaranteed to work right unless you load it with at least 200 mA.
Can I replace a power supply if I don't know the requirements?
If you are replacing a previous power supply and don't know the device's requirements, then consider that power supply's rating to be the device's requirements. For example, if a unlabeled device was powered from a 9 V and 1 A supply, you can replace it with a 9 V and 1 or more amp supply.
How to pick a power supply for a device?
For example, if a unlabeled device was powered from a 9 V and 1 A supply, you can replace it with a 9 V and 1 or more amp supply. The above gives the basics of how to pick a power supply for some device. In most cases that is all you need to know to go to a store or on line and buy a power supply.
What happens if a 12 volt power supply exceeds 1 a?
For a "12 volt 1 amp" supply, that means all is fine as long as you don't try to draw more than the rated 1 A. There are various things a supply can do if you try to exceed the 1 A rating. It could simply blow a fuse. Specialty OEM supplies that are stripped down for cost could catch fire or vanish into a greasy cloud of black smoke.
What is the current rating of a power supply?
The current rating of a supply is what it can deliver, not what it will always force thru the load somehow. In that sense, unlike with voltage, the current rating of a power supply must be at least what the device wants but there is no harm in it being higher. A 9 volt 5 amp supply is a superset of a 9 volt 2 amp supply, for example.
Can a 12V power supply be used with a 16V supply?
BUT trying to operate a 12V rated device from a 16V supply (25% high) is risky and may cause damage to device or supply. Current: the same or higher current. eg consider a 12V, 2A device and a 12V 20A power supply. 12V is the "electrical pressure". 20A is the electrical current that the supply CAN provide at that pressure.