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When 1 mega Ohm resistors are used?

  1. May 16, 2014 #1
    When and "for what purpose"/why are 1 mega ohm (1 MΩ) resistors used in filters, such as high pass filters? Is it with regards to electrostatic discharge or impedance matching?

    What difference does it make, if I only use a 10 K ohm resistor, when the high pass frequency will be the same (by changing the value of the capacitor)?
  2. jcsd
  3. May 16, 2014 #2


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    Science Advisor

    They are used, for example, as a feedback device in charge-sensitive amplifiers. If you use a 10 k Ohm resistor you can have more current that a 1 M Ohm resistor. Sometimes that matters.
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