1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Unit step and Unit impulse

  1. Feb 6, 2013 #1
    1. The problem statement, all variables and given/known data
    Hi,can someone explain to me through real world examples what the unit step and unit impulse means in systems control?How are they related to the system's input? Thank you.

    2. Relevant equations
    δ(t) = unit umpulse
    u(t) = unit step

    3. The attempt at a solution
  2. jcsd
  3. Feb 6, 2013 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Well, for one thing they ARE system inputs.

    If you have a network with a battery as input, and you throw a switch which changes the input to your network from 0 volts to E volts, then your system input is E*u(t).

    δ(t) is more complex. Picture a voltage E again, but this time throw the switch on and off for a very short time T. By 'very short' I mean much shorter than the shortest time constant in your network. Then the input to your network is E*T*δ(t) volts.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook