Need help making a circuit :(

Discussion in 'General Electronics Chat' started by nebachdnezzar, May 11, 2008.

  1. nebachdnezzar

    Thread Starter New Member

    May 11, 2008
    Hello guys

    I am really new to circuits and i am not stupid, (although i may seem it to you guys). I need help to make a circuit that has 100ma of current going through it, i dont mind the voltage. And the circuit must be powered by a battery of any type. I know this may seem ridicoulsly easy to you guys but i am very new to this and have no idea on how to do this. Could someone pleaseeeeee explain how i may do this.
  2. Audioguru


    Dec 20, 2007
    A 1.5V alkaline battery cell makes a current of 100mA when it is new and when the resistance of the load is 1.5V/100mA= 15 ohms.
    A 9V alkaline battery makes a current of 100mA for a few minutes when it is new and its load resistor is 9V/100mA= 90 ohms.
    The simple calculation is called Ohm's Law.
  3. silvrstring

    Active Member

    Mar 27, 2008
    I=E/R, so as long as you set it up so that the Bat (E) divided by the resistance (R) equals .1, you'll be fine (e.g. 10V and 100 ohms).