analogue components help

Discussion in 'General Electronics Chat' started by dogg, Jul 2, 2014.

  1. dogg

    Thread Starter New Member

    Jul 2, 2014
    Hi new to this so sorry if I the wrong place

    Im in need of some questions answered and some help understanding them about analohue electronic components

    how do the terms on amd off amd high resistance and low resistance relate to BJT

    If a darlington pair has a base current of 1mA and the current through the collector is 500mA what is the gain of the transistor

    describing SCR ratings of reverse voltage and forward voltage
  2. Robin Mitchell

    Distinguished Member

    Oct 25, 2009
    Well, if a transistor is "on" then current can flow through with relative ease, that is it has a low resistance. If the transistor is "off" then current flow is either small or non existance, in other words it has a high resistance.

    If a darlington transistor has 1mA base current with a collector current of 500mA then the gain is the output divided by the input, in this case 500mA / 1mA = 500
  3. dogg

    Thread Starter New Member

    Jul 2, 2014
    Okay thanks that makes it easier

    Also do you know what the purpose of dual charger circuit and zener diode as voltage stabiliser is and what the diode is doing to the current or voltage,
  4. shteii01

    AAC Fanatic!

    Feb 19, 2010
    Sounds suspiciously like Homework.
    ErnieM and KJ6EAD like this.
  5. dogg

    Thread Starter New Member

    Jul 2, 2014
    Could be.. its hard