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Himanshu posted an Question
June 12, 2020 • 06:21 am 30 points
  • IIT JAM
  • Physics (PH)

Electricity capacitor

Kindly explain me reason behind these three statements????? 1) Capacitor in series is used when the required capacity is less than the least capacity of given capacitor. 2) Capacitor in parallel gives high capacity at low potential. 3) If capacitor are in parallel we can store any amount of charge in it.

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  • comment-profile-img>
    Dhairya sharma

    see attached.

    cropped3317641289878533539.jpg
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    by following this what problem arises with series combination????

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    in series capacitance will be mimimum

  • comment-profile-img>
    Chandra prakash

    First of all I'd like to clarify a very common misconception about capacitors. Capacitors do not actually store charge, net charge inside a capacitor remains the same throughout. They rather store energy in the form of electric field existing between the plate. Coming to your question, YES it can be used similar to a battery by controlling it's charging and discharging time. In case of further clarifications feel free to ask in the comment. Hope this helps!.

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    this for my 3 Question right !!! so sir what cases arises with series combination in storing???

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    yes

  • comment-profile-img>
    Chandra prakash

    For a fair comparison, compare it to gravity. Voltage is a measure of potential energy (or energy per charge, or Joules per Coulomb). Gravity has potential energy in the same way -- potential energy equals mass * height * acceleration constant, or mgh. Let's move that mass up (give it some potential energy), then drop it down, then move it around and then put it back in the same place it was before. When it's back in the same place, the gravitational potential energy is the same as it was before -- mgh. The same goes for voltage. Take any path you choose, around in any directions and through whatever paths you pick. When you end up back in the place you started, the potential energy must be the same. This gives us Kirchoff's voltage law: The sum of the voltages in a loop (that is, the sum of how the potential energy changes along a path that comes back to its original point) must equal zero. From there, it is pretty simple to derive why parallel circuits have the same voltage across every branch. Let's draw some loops. Start at the bottom, trace through the battery, then trace down the first branch (the first resistor). -V_battery + V_resistor1 = 0, so V_resistor1 must be equal to V_battery. Now let's trace a loop through the second resistor branch. -V_battery + V_resistor2 = 0, so V_resistor2 = V_battery. Keep it up and you'll see that all of the parallel resistors must have the same voltage. I used mathematical equations, but they're nothing more than manifestation of that rule -- if you end up at the same place, you have to be at the same potential energy.

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