From what? If you need 12VDC for temporary use, there is a very good 12VDC source in your PC power supply.
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.
Yes, you can. Here's why. If a supply's output is rated at 12 volts DC (12 VDC) and 500 milliamperes (500mA), it can deliver a maximum of 500mA at the 12 volt rating. You want to use a 12VDC supply that is rated at 1A (1000mA). That means that the supply is capable of delivering up to 1A at 12VDC. Now the crux of the matter. Your device, that's the load on the supply, needs 12VDC to operate. Your replacement supply is rated at 12VDC. No problem. Your supply delivered a max of 500mA. That does NOT mean that your load, that thing you're powering up, actually uses all 500mA. Your load knows how much current it needs to draw. Your supply has to be rated for more than that. Your supply was rated at 500mA. It worked well. The supply you wish to use will deliver a max of 1A (1000mA). It will easily supply the current your load will use. Oh, and the polarity of the new supply must be the same as that of the old one. That's pretty obvious. Always be safe and consult an electronics specialist for electrical questions. There are a number of savvy folks working at consumer electrical outlets who can get you up to speed.
You can use a resistor to reduce the current output. However, it's important to match the resistor's value to achieve the desired current output. To drop the current from 1000mA to 500mA, you would need a resistor with a resistance of about 12 ohms (Ohm's Law: R = V/I). Be cautious with this approach as it may generate heat and reduce the efficiency of the charging process. It's recommended to use a proper voltage regulator or charger designed for the specific current requirements of the battery.
A 12v AC adapter can be use to power devices that requires 12VDC and up to 500mA. It can also be use with electrical devices that require power but do not contain internal components to derive the required voltage and power from the main power.
Almost all cars in NZ have 12VDC electrics. Most portable generators which produce 230VAC, will also have a 12VDC accessory output for battery charging, etc. There are no general reticulations of 12VDC.
850va 12vdc inverter transformer praemari tans
From your question I assume you are referring to a charging adapter for a piece of electronic equipment. I believe adapters also contain a rectifier that rectifies AC voltage to DC. The one I'm looking at at this moment does this. Your thinking is correct, in that any thing that transforms the voltage to what you need is all you need for that step. But if your adapter rectifies the voltage you will need a rectifier with your transformer.
To convert 12VDC to 120VAC at 9.5A, you will need a minimum of 95A of 12VDC current. This calculation is based on the premise that power remains the same in both systems (P=VI), ignoring inefficiencies and losses in the conversion process.
Most all are 12vdc
One. 12VDC 54AH.
It stands for "12 volts, direct current".