# 12vdc vs. 12vac

Discussion in 'General Electronics Chat' started by Lightfire, May 6, 2011.

1. ### Lightfire Thread Starter Well-Known Member

Oct 5, 2010
690
21
Hello,

I just want to ask if what is the difference between 12VDC and 12VAC.

I see that VDC is just constant direction and VAC is reversing overtime.

Now, which is powerful 12VDC or 12VAC? If I touch for example the 12VAC terminals/wires or so, will I get shock?Or just like the feeling of touching 12VDC?

Lightfire

2. ### magnet18 Senior Member

Dec 22, 2010
1,232
125
It's like the difference between 120VAC and 12VDC, except you only have 12VAC.
neither is super-dangerous, but both can hurt you, so don't go touching them, especially if they are at high current.
Where are you getting 12VAC from? a 10-1 transformer?

3. ### Lightfire Thread Starter Well-Known Member

Oct 5, 2010
690
21
No, I touch the terminals of my 12VDC/12AH battery and nothing happen. It's not hurty.

Anyway, I am planning to build an inverter which will be like this.
12VDC/12AH(battery) to 12VAC/12AH (if possible)

can you give me a schematic????

4. ### debjit625 Well-Known Member

Apr 17, 2010
790
186
If the AC value is given in RMS then both are equal in power.

if the AC value is in RMS then the peak value will be higher i.e.. 12 / 0.707 = 16.973 or 17 volts peak,normally your body will not get shock in that range.

You can look at the AC lessons of AAC's ebook for more details on the difference between DC ,AC and RMS value of AC.

Good Luck

5. ### cjdelphi New Member

Mar 26, 2009
272
2
lol, you can touch the terminals of a 12volt battery very safely, just make sure you don't have a cut or wound you're touching any kind of battery with, even a 9volt battery can kill you if you penetrate the skin

under your skin there's a lot lower resistance and enough current to kill you....