Computers & Binary (Cambridge (CIE) IGCSE Computer Science)

Revision Note

Robert Hampton

Written by: Robert Hampton

Reviewed by: James Woodhouse

Why Computers Use Binary

Why does data have to be converted to binary to be processed by a computer?

  • Data is processed in a computer using logic gates that only have two states

  • The binary number system only has two digits (1/0), which means each digit can represent a different state (1 = on, 0 = off)

  • All data must be converted to binary before a computer can understand and process it

  • Converting data to binary allows computers to process it at an incredible speed, perform complex calculations and store vast amounts of data efficiently

Hard drive and CD to show polarity, pits and lands
  • Secondary storage is a great example of the process

    • Magnetic hard drives use North and South polarity to represent a 1 or a 0

    • In Optical disks, light hitting a flat area (land) is interpreted as a 1 and light hitting a bump (pit) is interpreted as a 0

  • Take an example of driving a car

    • When driving a car the accelerator pedal is used to increase the cars speed

    • If a car was accelerating from 50mph to 100mph the increase would be gradual

    • In a computer system, the car is doing either 50mph (0) or 100mph (1), there is no in-between

    • Trying to change the computer system so that it has more options would be less efficient and require more complex parts for the computer to understand

Worked Example

Explain why computers process data in binary format [2]

Answer

  • Computers process data using logic gates... [1]

  • ... that can only have two states (1/0) [1]

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Robert Hampton

Author: Robert Hampton

Expertise: Computer Science Content Creator

Rob has over 16 years' experience teaching Computer Science and ICT at KS3 & GCSE levels. Rob has demonstrated strong leadership as Head of Department since 2012 and previously supported teacher development as a Specialist Leader of Education, empowering departments to excel in Computer Science. Beyond his tech expertise, Robert embraces the virtual world as an avid gamer, conquering digital battlefields when he's not coding.

James Woodhouse

Author: James Woodhouse

Expertise: Computer Science

James graduated from the University of Sunderland with a degree in ICT and Computing education. He has over 14 years of experience both teaching and leading in Computer Science, specialising in teaching GCSE and A-level. James has held various leadership roles, including Head of Computer Science and coordinator positions for Key Stage 3 and Key Stage 4. James has a keen interest in networking security and technologies aimed at preventing security breaches.