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Asked: September 4, 20202020-09-04T09:48:49+00:00 2020-09-04T09:48:49+00:00In: Electricity and Magnetism

CONTROL GRID

CONTROL GRID

The control grid in a cathode ray oscilloscope (CRO) is used to control the brightness of the beam on the screen. Explain how this is achieved.

control gridcrocrt
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3 Answers

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  1. Fredrick ouma
    Fredrick ouma Begginer
    2020-09-04T10:11:45+00:00Added an answer on September 4, 2020 at 10:11 am

    When the grid is set a higher negative potential few electrons/cathode rays strike the screen thus the brightness is reduced.
    When it’s set at a higher positive potential more electrons/cathode rays strike the screen thus the brightenes increases.

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  2. Quest
    Quest Pundit
    2020-09-04T14:19:01+00:00Added an answer on September 4, 2020 at 2:19 pm

    When the potential difference is increased more electrons reach the screen making the spot brighter. When the p.d is decreased fewer electrons reach the screen making the spot less bright.

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  3. michaelwanyumu
    michaelwanyumu Begginer
    2020-09-10T18:47:07+00:00Added an answer on September 10, 2020 at 6:47 pm

    When the negativity of the grid is increased, fewer electrons cross it; the intensity of the beam decreases, reducing the brightness of the spot on the screen.
    When the grid is made less negative, more electrons cross, increasing the intensity of the electron beam. This increases the brightness of the spot on the screen.

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