I'm really new to Electrical circuits so please bear with me. I studied how set latch works :firstly, input 0 then Q(let's say output and it's 0 i this case) feedback another input resulting output 0. Then if I input 1, the output Q turns into 1, as a result it latches 1.
Here's my question. How do you know that output Q is 0 in the first place even though there is only one input gets 0 (the other input is affected by the output)?