Fetch-Execute Cycle

1(a) What do the initials CPU stand for?

C: Central

P: Processing

U: Unit

(b) List three components of the CPU.

CPU, ALU (arithmetic logic unit) and registers

(c) In relation to computer architecture, what are buses?

Communication system that transfers data between components inside a computer. 

2(a) Program counter

Is a register in a computer processor that contains the address of the instruction being executed at the current time. 

(b) The address bus

An address bus is a computer bus (a series of lines connecting two or more devices) that is used to specify a physical address.

(c) The data bus

Is a computer subsystem that allows the transferring of data from one component to another.

(d) The decoder

Undoes the encoding so that the original information can be received.

 (e) The Arithmetic and Logic unit

In digital electronics, an arithmetic logic unit (ALU) is a digital circuit that performs integer arithmetic and logical operations. The ALU is a fundamental building block of the central processing unit of a computer, and even the simplest microprocessors contain one for purposes such as maintaining timers.