Question

In positive logic, the logic gate 1 corresponds to
(A) Positive voltage
(B) Zero voltage
(C) Lower voltage level
(D) Higher voltage level

Answer 1

Hint: The logic state of either 1 or 0 in an electronic circuit is assigned based on the voltage levels. Typically, the assignment of the logic state in a logic circuit is analogous to its name which is either positive or negative logic circuit.

Complete step by step solution: The higher state is always defined as logic 1 and the lower state as 0. But, it is not necessary that the higher voltage level should be positive.
For instance, we can have state 0 as -15V and state 1 as -10V.
So, in a positive logic, the logic gate 1 corresponds to a higher voltage level.

The correct option is C.

Note: The output of an electronic circuit typically is assigned logic values which are the Boolean values that are either 1 or 0. A value of 1 represents some useful action or the output of something like turning on the switch or actuating a valve. All these in turn depend on the voltage levels at which such a useful action can happen. Typically, we can have both the positive and negative logic systems. In a positive logic system, a value of 1 and 0 are assigned to the higher and lower voltage. In this case, an action would be taken when the voltage corresponds to or exceeds higher or typically positive ones. On the other hand, for a negative logic circuit it is opposite to the previous ones, where logic of 0 would be assigned to highest positive voltage and a logic of 1 for the lower voltage that could be even negative voltage at which we need an action or the useful output.