What two types of voltage signals are used by computer inputs and outputs?

What two types of voltage signals are used by computer inputs and outputs?

• A. Analog and digital
• B. Alternating and direct
• C. Pulse and analog
• D. Digital and PWM

Answer: (A)

Two main voltage signal types are digital and analog. Digital signals switch between discrete levels, typically representing binary 0 and 1, which makes them straightforward for computers and digital logic to process and for data transfer between devices. Analog signals vary continuously, carrying a range of voltages that can represent real-valued quantities like sound, temperature, or light intensity. Some hardware uses PWM to approximate an analog voltage by rapid switching, but that’s a technique applied to digital signals, not a separate signal type. Terms like AC vs DC or calling signals “pulses” describe specific aspects or methods, not the fundamental categories used to describe computer I/O.

Two main voltage signal types are digital and analog. Digital signals switch between discrete levels, typically representing binary 0 and 1, which makes them straightforward for computers and digital logic to process and for data transfer between devices. Analog signals vary continuously, carrying a range of voltages that can represent real-valued quantities like sound, temperature, or light intensity. Some hardware uses PWM to approximate an analog voltage by rapid switching, but that’s a technique applied to digital signals, not a separate signal type. Terms like AC vs DC or calling signals “pulses” describe specific aspects or methods, not the fundamental categories used to describe computer I/O.