Relationship of the base resistor and the collector resistor in turning on / off a 12V load with 5V using a transistor
This isn't an answer but is required to generate a temporary sample schematic. If you edit this question, then edit the schematic you can cut and paste the contents into a schematic in your original post. I will then delete this post.







simulate this circuit &ndash; Schematic created using CircuitLab

Normally we are interested in collector current as shown in (b) rather than emitter current (a) as the collector current is what we are trying to control.