(a) What are input devices? (b) list two input devices (c) State two uses of logic gates (d) Draw and label the logic gate symbol for; (i) OR gate (ii) AND ...

Answer Details

(a) What are input devices?

Input devices are hardware devices (peripherals) connected to a computer that are used to enter data, instructions, commands or signals into the computer system for processing. They allow the user to interact with and control the computer.

(b) Two input devices

1. Keyboard
2. Mouse

(Scanner, joystick, microphone, light pen, webcam, barcode reader and fingerprint scanner are also acceptable.)

(c) Two uses of logic gates

1. They serve as the building blocks of digital electronic circuits, used to construct the Arithmetic and Logic Unit (ALU), adders and memory cells inside the processor.
2. They are used as decision-making elements in control circuits such as burglar alarms, traffic-light controllers and automatic push-button lock circuits.

(d) Logic gate symbols

(i) OR gate – the output is 1 when at least one of the inputs A or B is 1.

(ii) AND gate – the output is 1 only when both inputs A and B are 1.