KwickClips Computer Systems

Computer Systems: 121 short revision clips

One idea per clip, with the answer written out underneath. Each clip links back to the full Computer Systems lesson it came from.

Flow of input, process, output and storage using a report card example.

What is the first step?42 sec

Table: speed very fast, accuracy no own errors, storage huge data, diligence never tired.

What does diligence mean here?41 sec

Table of computer uses: home UPI, school smart boards, work bank accounts, hospital scans.

Name one school use.40 sec

Table of computer types: micro laptop, mainframe bank servers, super weather PARAM, embedded microwave.

Is your phone a computer?44 sec

Timeline: abacus ancient, Pascaline 1642, Jacquard loom 1804, Analytical Engine 1837.

Which machine used punched cards first?40 sec

Table of five generations with vacuum tubes, transistors, integrated circuits, microprocessors and AI.

What did the second generation use?44 sec

Doubling table: now 1,000, +2 years 2,000, +4 years 4,000.

How often do transistors double?40 sec

Slide: AI in everyday apps, quantum computers, cloud power, smaller chips.

What is cloud computing?40 sec

Simple block diagram: input unit, memory unit, CPU, output unit with arrows.

What must you do in the exam diagram?40 sec

Diagram of the CPU with ALU, control unit and registers.

Which part does the calculations?42 sec

Table: input keyboard, output monitor, RAM loses data, ROM keeps data.

Why is unsaved work lost?40 sec

Table: address bus where one way, data bus what two way, control bus read or write two way.

What is a bus?40 sec

Diagram of Von Neumann architecture: memory holding program and data, one CPU.

What is the stored program concept?41 sec

Cycle diagram: fetch, decode, execute, repeat.

What are the three steps?40 sec

Table: cores tasks at once, cache less waiting, clock steps per second.

What does more cache reduce?41 sec

Table: CISC most laptops, RISC most phones.

What is an instruction set?39 sec

Slide: input device sends data in, turns actions into signals, first step of input-process-output.

What does a keyboard send?39 sec

Table: keyboard text, mouse pointing, scanner images, microphone sound.

Which device gives sound?37 sec

Table: barcode product code, QR code link or UPI ID, touch screen input and output.

Where does the price come from?42 sec

Table: motion movement, temperature heat, light brightness.

Who gives input to an automatic door?39 sec

Table: soft copy on screen, hard copy printed page.

Is a result on screen a hard copy?38 sec

Table: monitor pixels, resolution more is sharper, projector lumens.

What is resolution?40 sec

Table: inkjet colour photos, laser fast text, 3D solid objects.

Which printer suits a family printing a few photos?44 sec

Table: speaker sound waves, motor movement, pump water flow.

What is an actuator?40 sec

Slide: CPU processes but stores little, input waits in memory, results wait before output.

What does memory hold?41 sec

Table comparing SRAM and DRAM: refresh, speed, cost, used for.

Why was the unsaved essay lost?48 sec

Table of ROM types: PROM cannot erase, EPROM UV light, EEPROM electricity.

Which memory keeps data with the power off?44 sec

Memory hierarchy table: registers fastest bytes, cache very fast MB, RAM fast GB, storage slower huge.

Where are registers?48 sec

Slide: RAM is volatile, small and costly per GB.

Why can ROM not hold your files?40 sec

Table: magnetic HDD tape magnets, optical DVD laser, solid state SSD flash chips.

Which is cheapest for large backups?44 sec

Table: any device but needs internet, auto backup but privacy risk.

What is the cloud, really?41 sec

Flowchart: RAM free? load app, else move pages to disk, then load app.

What is virtual memory?38 sec

Table: nibble 4 bits, byte 8 bits, 1 KB 1024 bytes, 1 MB 1024 KB.

How many bits in a byte?49 sec

Table: big to small x1024 2 GB is 2048 MB, small to big /1024 5120 MB is 5 GB, bytes to bits x8.

How do you convert MB to GB?43 sec

Flowchart: file to Recycle Bin, restore or empty, entry removed and space marked free.

What does delete really do?40 sec

Slide: recovery software rebuilds files, buyer sees photos and passwords, encrypt and factory reset.

Why is recovery a security risk?38 sec

Table: touch yes or no, keyboard vs Chrome, wear vs bugs.

How do you fix a hardware fault?37 sec

Table: OS Android, utility antivirus, driver printer driver.

What loads first when you switch on?40 sec

Table: general Word and Excel, specific train booking.

Which kind is a school fee system?39 sec

Table: firmware in a chip, open source public code, proprietary secret code.

Name an open source example.41 sec

Table: machine 10110000, assembly ADD AL 3, high level print(a + b).

Which language runs directly?39 sec

Table: reads whole code vs line by line, errors all at end vs stops at one, executable yes or no.

Which is usually faster to run?42 sec

Slide: assembly to machine code, one mnemonic one instruction, machine dependent.

What does an assembler translate?38 sec

List: editor with auto-complete, run button, error diagnostics, debugger.

What does a debugger let you do?38 sec

Slide: OS manages hardware and software, sits between apps and hardware, loads first at boot.

Name two operating systems.37 sec

Table: process shares CPU, memory shares RAM, file organises folders, device runs printer.

What is a process?42 sec

Table: single user Windows 11, multi user Linux server, real time airbag, mobile Android.

What does real time mean?39 sec

Table: CLI commands harder fewer resources, GUI icons easier more resources.

Which uses less memory and CPU?45 sec

Full Computer Systems lessons All KwickClips

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Computer Systems: 121 short revision clips

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