Title: I&#x27;m reading Petzold&#x27;s <i>Code</i> [1], and it dawned on me that I didn&#x27;t understand logic gates intuitively until now. I took a Computer Architecture course back in college, and I understood what logic gates meant in boolean algebra but not empirically. Petzold clarified this for me by going from the empirical to the theoretical using a lightbulb, a battery, wires, and relays (which he introduces when he talks about the telegraph as a way to amplify a signal).<p>Another concept is the relationship between current, voltage, and resistance. For example, I always failed to understand why longer wires mean more resistance while thicker wires mean less resistance.<p>[1]: <a href="https:&#x2F;&#x2F;www.codehiddenlanguage.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.codehiddenlanguage.com&#x2F;</a>
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