# Logic Gates

Controlling electricity gives us the ability to make yes and no decisions or

and **true**

. By combining two signals, we can give a single **false**

or **true**

answer, depending on the **false**

. The flow of electricity is controlled using **logic**

(no, not named after Bill Gates - like a gate).**gates**

The simplest gate, this item

or reverses the signal. $Q= \overline A$ **inverts**

Input (A) | Output (Q) |

0 | 1 |

1 | 0 |

The two "universal" gates are

and **NOR**

- it is said that you can create all the other logic gates with a combination of just these two.**NAND**

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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