GCSE COMPUTER SCIENCE (OCR) ACTUAL 2026
QUESTIONS AND 100% CORRECT ANSWERS
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Terms in this set (246)
Arithmetic Logic Unit (ALU) Performs operations on data e.g. Addition,
subtraction
Control Unit (CU) Coordinating activities of the CPU
Registers Quick, small stores of data within the CPU
, Memory Address Register (MAR) Holds memory address for data or a instruction
about to be used by the CPU
Memory Data Register (MDR) Holds actual data or instruction
Accumulator Stores results of calculations in the ALU
Program Counter (PC) Holds memory address of the instruction for each
cycle
Fetch The next instruction is retrieved by CPU from main
memory
Decode The instruction is broken down and decided so
computer can understand
Execute The CPU performs what the instructions told
Embedded System A computer system built within a large device e.g.
Camera, washer, car
Volatile Memory loses its data when power of
Non-volatile Memory retains its data when power is lost
Random Access Memory (RAM) Read/write - function is to load open programs and
operating system data currently in use - volatile
QUESTIONS AND 100% CORRECT ANSWERS
Play your way to mastery with fun games
Match Blocks Charms NEW
Terms in this set (246)
Arithmetic Logic Unit (ALU) Performs operations on data e.g. Addition,
subtraction
Control Unit (CU) Coordinating activities of the CPU
Registers Quick, small stores of data within the CPU
, Memory Address Register (MAR) Holds memory address for data or a instruction
about to be used by the CPU
Memory Data Register (MDR) Holds actual data or instruction
Accumulator Stores results of calculations in the ALU
Program Counter (PC) Holds memory address of the instruction for each
cycle
Fetch The next instruction is retrieved by CPU from main
memory
Decode The instruction is broken down and decided so
computer can understand
Execute The CPU performs what the instructions told
Embedded System A computer system built within a large device e.g.
Camera, washer, car
Volatile Memory loses its data when power of
Non-volatile Memory retains its data when power is lost
Random Access Memory (RAM) Read/write - function is to load open programs and
operating system data currently in use - volatile
