In positive logic, which statement about voltage levels is true?

In positive logic, which statement about voltage levels is true?

• A. High represents 0; Low represents 1
• B. High represents 1; Low represents 0
• C. High represents 0; Low represents 0
• D. High represents 1; Low represents 1

Answer: (B)

In positive logic, a high voltage level is interpreted as a logic 1 and a low voltage level as a logic 0. This convention means the true mapping is High → 1 and Low → 0. It aligns with signals that indicate an asserted or present condition, often near the supply voltage for high and near ground for low, with defined thresholds to tolerate noise. Thus the statement that high represents 1 and low represents 0 is the correct description for positive logic. The other mappings either invert the convention (high would be 0, low would be 1) or assign the same value to both levels, which isn’t meaningful for digital signaling.

In positive logic, a high voltage level is interpreted as a logic 1 and a low voltage level as a logic 0. This convention means the true mapping is High → 1 and Low → 0. It aligns with signals that indicate an asserted or present condition, often near the supply voltage for high and near ground for low, with defined thresholds to tolerate noise. Thus the statement that high represents 1 and low represents 0 is the correct description for positive logic. The other mappings either invert the convention (high would be 0, low would be 1) or assign the same value to both levels, which isn’t meaningful for digital signaling.