Question

Which among the following is a memory less system?

(a) Delay

(b) Summer

(c) Resistor

(d) Capacitor

I have been asked this question in class test.

This is a very interesting question from Properties of Systems topic in portion Signals and Systems Basics of Signals and Systems

Answer 1

Correct option is (c) Resistor

To explain: Options Delay, Summer and Capacitor are all systems with memory as they depend upon past, past and present, past and present values of input respectively. Whereas, a resistor is a memory less system as its relationship with output always depends upon the current or present state of the input.