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Hoework help

  1. Jul 19, 2005 #1
    Electrons in a television set are accelerated through a potential difference of 2.0 kV.
    (a) Find the speed of the electrons when they reach the screen. Ignore any relativistic effects.

    how to do this i have no idea what formula to use
     
  2. jcsd
  3. Jul 19, 2005 #2

    OlderDan

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    Homework Helper

    What is the definition of electric potential? The problem tells you how much the electron's electric potential will change. How much will its potential energy change? How much will its kinetic energy change? Assume the electron starts at test. How much velocity does it acquire?
     
  4. Jul 19, 2005 #3
    check here:
    http://hyperphysics.phy-astr.gsu.edu/hbase/electric/ev.html#c2
    see above URL page to find (for charge initially at rest):
    (work done on charge q by potential difference ΔV) = (1/2)mv2 = qΔV

    other concepts you may need later:
    http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elewor.html#c1
     
    Last edited: Jul 19, 2005
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