I'm taking an online course and some very basic stuff has been left out. In a recent test, I was asked about when a relay was activated by a transistor if the collector goes high or goes low. The problem is that I was never taught these terms.
The professor for the class defined them as:
"Basically when a transistor goes high (NPN) that means that it is turned on and conducting. Going low (NPN) means that the transistor is off and not conducting."
This doesn't explain why the relay pulls in when the collector goes low. Can someone please either explain these terms or point me to a page that does? Thanks so much! I've been trying to get my professor to give me a more clear explanation for about a week, and he just won't do it. I feel like an idiot, but I want to learn this.
-- Felicia
The professor for the class defined them as:
"Basically when a transistor goes high (NPN) that means that it is turned on and conducting. Going low (NPN) means that the transistor is off and not conducting."
This doesn't explain why the relay pulls in when the collector goes low. Can someone please either explain these terms or point me to a page that does? Thanks so much! I've been trying to get my professor to give me a more clear explanation for about a week, and he just won't do it. I feel like an idiot, but I want to learn this.
-- Felicia