I'm learning about logic gates and circuit design. Up until this point, I’ve believed (wrongly?) that a logically TRUE state for an input, call it "a", works out physically to a 5v current for TURE and no current at all for false. As such, a NOT gate would simply stop current going into it, which...clearly doesn't make any sense.
Looking at inverters (NOT gates), though, there seems to be something screwy about ‘inverting’ the current to make it backwards (negative?) somehow? Do I have things wrong? Is it really the case that all inputs are electrically ‘on’ all the time and logic is performed by transistors evaluating whether the current is TRUE or FALSE (i.e. ‘normal’ or inverted)?
What’s the deal? What's going on at an electrical level that makes a current True or False?
Looking at inverters (NOT gates), though, there seems to be something screwy about ‘inverting’ the current to make it backwards (negative?) somehow? Do I have things wrong? Is it really the case that all inputs are electrically ‘on’ all the time and logic is performed by transistors evaluating whether the current is TRUE or FALSE (i.e. ‘normal’ or inverted)?
What’s the deal? What's going on at an electrical level that makes a current True or False?