Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Simple i suppose ?

  1. Dec 12, 2009 #1
    This is bugging me for some reason .. can any one help me with this ?


    the current flowing through an element is
    i= {2A, 0<t<1
    2t^2, t>1}
    calculate the charge entering the element from t=0 to t=2 second
     
  2. jcsd
  3. Dec 12, 2009 #2

    CompuChip

    User Avatar
    Science Advisor
    Homework Helper

    What is the relation between charge, current and time?
     
  4. Dec 12, 2009 #3
    I have no other data regarding the question :/ can you help me ?
     
  5. Dec 12, 2009 #4

    CompuChip

    User Avatar
    Science Advisor
    Homework Helper

    Well, current is simply a moving charge. In fact it is defined as the rate at which charge passes:
    [tex]I = \frac{\Delta Q}{\Delta t}[/tex]
    or, in the limit of vanishing [itex]\Delta t[/itex],
    I(t) = dQ/dt (the derivative).

    Try integrating both sides of that equation.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook