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

 

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

 

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,

 

Sounds suspiciously like Homework.

 

Could be.. its hard