2.1

## Raspberry Pi Foundation

Skip to 0 minutes and 3 secondsWelcome to week two of the course. Last week you learned how computers use binary and electronic switches called transistors to represent numbers. This week we're going to look at combining those transistors together to make logic gates, and learn how we can use those circuits to perform basic arithmetic. In the next step, I'll introduce you to the NAND gate.

# Welcome to Week 2

What have we learned over the past week?

Last week, we learned a little about the history of computing, and then dived into a little bit about electrical engineering.

We learned that transistors can act like switches, and be used to represent the states 0 and 1. We also learned how computers are able to count using only the numbers 0 and 1.

So far, then, we have all the key pieces to build ourselves a computer. We know how to perform conversions between binary and denary, and we know how to represent 1s and 0s using electronics.

Let’s now explore the electronics a little more deeply, to see how we can actually process binary data to perform useful functions.