Which term describes the logic convention where a high voltage represents 0 and a low voltage represents 1?

Which term describes the logic convention where a high voltage represents 0 and a low voltage represents 1?

• A. Positive Logic
• B. Truth Table
• C. OR Logic Gate
• D. Negative Logic

Answer: (D)

In this convention, the voltage level used to represent a logic value is inverted compared to the usual. Negative logic means a high voltage is interpreted as 0 and a low voltage is interpreted as 1. This approach is common for active-low signals, where pulling a line low indicates an asserted condition and signals are often easier to wire with pull-up resistors. Positive logic would map high voltage to 1 and low to 0, so it’s the opposite of what’s described here. The other terms refer to different ideas: a truth table shows how inputs map to outputs for a function, and a specific gate like OR defines a rule for combining inputs, not the polarity convention of the logic levels.

In this convention, the voltage level used to represent a logic value is inverted compared to the usual. Negative logic means a high voltage is interpreted as 0 and a low voltage is interpreted as 1. This approach is common for active-low signals, where pulling a line low indicates an asserted condition and signals are often easier to wire with pull-up resistors. Positive logic would map high voltage to 1 and low to 0, so it’s the opposite of what’s described here. The other terms refer to different ideas: a truth table shows how inputs map to outputs for a function, and a specific gate like OR defines a rule for combining inputs, not the polarity convention of the logic levels.