Logic Gates

Controlling electricity gives us the ability to make yes and no decisions or true and false. By combining two signals, we can give a single true or false answer, depending on the logic. The flow of electricity is controlled using gates (no, not named after Bill Gates - like a gate).

Standard Logic Gate Symbols

The simplest gate, this item inverts or reverses the signal. Q=A‾Q= \overline A

Input (A)

Output (Q)

0

1

1

0

The two "universal" gates are NOR and NAND - it is said that you can create all the other logic gates with a combination of just these two.

There are tons of videos available about logic gates. If I had to pick a favourite, my current is this one, although she talks incredibly fast and you might need to slow it down or rewind.

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