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Math Help - Calculate the gain in kinetic energy of each electron.

  1. #1
    Member looi76's Avatar
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    Calculate the gain in kinetic energy of each electron.

    Question:
    The electrons in a TV tube are accelerated by a p.d. of 20  \ kW between the filament and the screen. The charge of the electron is 1.6x10^{-19} C. Calculate the gain in kinetic energy of each electron.

    Don't know which equation to use!, need help
    Last edited by looi76; May 9th 2008 at 01:15 AM.
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by looi76 View Post
    Question:
    The electrons in a TV tube are accelerated by a p.d. of 20  \ kW between the filament and the screen. The charge of the electron is 1.6x10^-19 C. Calculate the gain in kinetic energy of each electron.

    Don't know which equation to use!, need help
    W = \Delta K

    You are told the amount of work done on each electron, 20 kW.

    Is it possible you meant that the potential difference is 20 kV? In that case,
    W = qV = \Delta K

    -Dan
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