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Build and learn about an ‘AND’ and ‘OR’ computer logic circuit

Suitable For

Grade 8

Difficulty

3

Time Required

 <1 Week

Supervision

Required

What’s it about?

The first complex electronic appliances were all made up of various single components such as tubes, capacitors, coils and resistors and transistors. Today ‘integrated circuits’ may contain thousands of these single components built into a much smaller single unit that can perform a handful of operations. Such circuits can include storage of data ‘flip-flops’ and ‘gates’.

A ‘logic gate’ is a circuit that will allow passage of a signal under certain conditions only. The two most common computer logic gates are the ‘AND’ and the ‘OR’ gates. Use toggle switches to represent the concept of ‘AND’ and ‘OR’ computer logic gates in the following science experiment:

Topics covered

Integrated circuit, Logic gate, In Series, In Parallel, Binary code

What will I need?

  • SMALL ELECTRONIC BREADBOARD
  • INSULATED SOLID HOOK-UP WIRE
  • 4x SINGLE THROW SWITCHES
  • 2x LED LIGHTS
  • 6-VOLT BATTERY
  • SOLDERING IRON & WIRE
  • WIRE CUTTERS
  • ADULT HELPER

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

All information stored on a computer system is in ‘binary code’, represented by either a one or a zero. Computer logic gates have two or more ‘inputs’ and one ‘output’, which can be either one or zero, used to read the binary code. The chart in the e-book worksheet indicates the output value for all possible ‘AND’ and ‘OR switch combinations. (Full explanation in the e-book version of this science project…)

Like the sound of it?

Why not check out the full worksheet in one of our popular e-books?

This particular science project can be found in any of the following Experiland e-books:

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