GCSE Computer Science Explained AQA 8525   OCR J277

Companion site to the YouTube channel

GCSE Computer Science, explained one bit at a time.

Short videos that take one topic at a time, from binary to Python. Worksheets and downloads to go with each video will live here.

  • Short. One idea per video.
  • Drawn, not filmed. No talking heads.
  • Exam-ready. Traps flagged in red.
python3>>> bin(71)
'0b1000111'
>>> chr(71)
'G'
>>>

01 Watch

Featured video

Featured video

Binary shifts

AQA 8525 3.3.4 OCR J277 1.2.4

Shift the bits left to multiply by 2 and right to divide by 2, and see which bits fall off the end.

A link to the YouTube channel will appear here once the first video is out.

10 Topics

What the course covers

Both AQA and OCR split GCSE Computer Science into a theory half and a programming half. These are the areas the videos will work through.

  • 01

    Data representation

    Binary, hex, characters, images and sound. How everything ends up as bits.

    First video in production
  • 02

    Computer systems

    What is inside the box: the CPU, memory, storage and the fetch-execute cycle.

    Planned
  • 03

    Networks

    How your phone finds a game server. LANs, WANs, protocols and layers.

    Planned
  • 04

    Cyber security

    Phishing, malware, brute force and the ways systems are protected.

    Planned
  • 05

    Algorithms

    Searching and sorting, step by step, plus how to trace them in the exam.

    Planned
  • 06

    Programming

    Python from variables to functions, with the exam-style questions that go with it.

    Planned

Quick check

What is 00010110 in denary?

Show the answer

22. The 1s sit under 16, 4 and 2, and 16 + 4 + 2 = 22.

11 Downloads

Worksheets and downloads

Free printable worksheets, answer sheets and one-page summaries for students, teachers and parents. The first set will go up alongside the first video.

  • binary-shifts-worksheet.pdfPractice questionscoming soon
  • binary-shifts-answers.pdfAnswer sheetcoming soon
  • data-representation-summary.pdfOne-page revision summarycoming soon

100 Contact

Get in touch

Questions about the videos or the materials? Email hello@gcsecsexplained.co.uk. We read every message, although we cannot offer individual tuition or mark coursework.