Amps and 12VDC supplies - any standards?

Discussion in 'General Electronics Chat' started by tcooper, Apr 29, 2010.

  1. tcooper

    Thread Starter New Member

    Apr 29, 2010
    Hi, I'm new to this and also a non engineer non circuits type of person so apologies if this is a daft question. We're building a new camera and I've been tasked with making sure the power to it is correct. It is planned to have 12VDC as its only power supply. the calculations show that it will draw 3.3amps of power when it peaks at a 25 watt power draw.

    Does anyone know if this is acceptable in terms of buildings and what they are designed to deliver?

    Thanks very much

    Whilst typing this question it strikes me that I might need to search for a power consumption type of forum ............
  2. SgtWookie


    Jul 17, 2007
    Well, 25 Watts is about the same as two of those new CCFL light bulbs, or about the same as running 3-1/3 "night lights" - it's not a lot of power.

    I'm assuming you're either in the UK or "Down under"; your power might be 220V 50Hz. A power supply that is 90% efficient would draw roughly 1/8 Ampere from 220v.
  3. ifixit

    Well-Known Member

    Nov 20, 2008
    Did you mean: 12V X 3.3Amps = 39.6 Watts?
    Did you mean 25 Watts divided by 12V = 2.1 Amps?

    Either way the wall outlet can supply that power easily.