What does “positive logic” mean in reference to logic devices?
The correct answer is B: High voltage represents a 1, low voltage a 0. What does 'positive logic' mean in reference to logic devices is that high voltage represents a 1, low voltage a 0. Positive logic uses high voltage for logic 1. For amateur radio operators, this is important for digital circuits. Understanding this helps when working with logic.
Exam Tip
Positive logic = high voltage represents 1, low voltage represents 0. Think 'P'ositive 'L'ogic = 'P'ositive voltage = '1'. Positive logic uses high voltage for logic 1. Not noise immunity, not true condition, not different positive levels - just high = 1, low = 0.
Memory Aid
"Positive logic = high voltage represents 1, low voltage represents 0. Think 'P'ositive 'L'ogic = 'H'igh = '1'. Positive logic uses high voltage for logic 1. Important for digital circuits."
Real-World Application
Positive logic in reference to logic devices: It means high voltage represents a 1, low voltage a 0. For example, +5V = 1, 0V = 0. This is what positive logic means - high = 1, low = 0.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Logic devices having high noise immunity isn't positive logic - positive logic is high voltage = 1. Noise immunity isn't the definition.
Option C: Incorrect. Logic circuit being in 'true' condition isn't positive logic - positive logic is high voltage = 1. True condition isn't the definition.
Option D: Incorrect. 1s and 0s defined as different positive voltage levels isn't correct - positive logic is high = 1, low = 0. Different positive levels isn't correct.
题目解析
The correct answer is B: High voltage represents a 1, low voltage a 0. What does 'positive logic' mean in reference to logic devices is that high voltage represents a 1, low voltage a 0. Positive logic uses high voltage for logic 1. For amateur radio operators, this is important for digital circuits. Understanding this helps when working with logic.
考试技巧
Positive logic = high voltage represents 1, low voltage represents 0. Think 'P'ositive 'L'ogic = 'P'ositive voltage = '1'. Positive logic uses high voltage for logic 1. Not noise immunity, not true condition, not different positive levels - just high = 1, low = 0.
记忆口诀
Positive logic = high voltage represents 1, low voltage represents 0. Think 'P'ositive 'L'ogic = 'H'igh = '1'. Positive logic uses high voltage for logic 1. Important for digital circuits.
实际应用示例
Positive logic in reference to logic devices: It means high voltage represents a 1, low voltage a 0. For example, +5V = 1, 0V = 0. This is what positive logic means - high = 1, low = 0.
错误选项分析
Option A: Incorrect. Logic devices having high noise immunity isn't positive logic - positive logic is high voltage = 1. Noise immunity isn't the definition. Option C: Incorrect. Logic circuit being in 'true' condition isn't positive logic - positive logic is high voltage = 1. True condition isn't the definition. Option D: Incorrect. 1s and 0s defined as different positive voltage levels isn't correct - positive logic is high = 1, low = 0. Different positive levels isn't correct.
知识点
Positive logic, Reference to logic devices, High voltage represents 1, Low voltage represents 0
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.