i'm experimenting with transistors, and wired one to my circuitboard. Though I got the LED to turn on with a NPN transistor, I'm not sure it's setup properly.
I read that current moves against the direction the arrow is pointing for the transistor symbol (emitter to collector), so I wired the emitter to a higher voltage (7.5V) than the base (4.5V). The problem is, when I remove the voltage source to the base, the LED remains lit. Shouldn't it turn off if the base truly acts like a switch for current flowing from emitter to collector?
I included two schematics below, one a crude, most likely incorrect representation of my circuit, and another from a book I'm learning from. My attempt at making a circuit follows my failure to get the schematic in the book to work - please let me know if you spot any errors in either schematic.