Calculating the current owning through a circuit using a power bank with different output

Discussion in 'General Electronics Chat' started by Ben Cawley, Jun 25, 2016.

  1. Ben Cawley

    Thread Starter New Member

    Jun 25, 2016
    So I am starting to build circuts to run using my raspberry Pi and have been doing research into electronics circuits.
    What I'm trying to work out is how a power bank output current affects the calculations of my circuts.

    I know voltage = current * resistance
    I know that the current across a serial circuit resister the same
    I know that a current across a parrall circuit is the tottal of the current across all the resisters in parrall with eatch other.

    But say I had a serial circuit with a 1k, 10k and 2k resister with a 9v batterey how would a powerbank with a 1amp output change the calculations of current in my circuit from a powerbank that outputs 2 amps
  2. KeepItSimpleStupid

    AAC Fanatic!

    Mar 4, 2014
    It doesn't. It's like the car battery that CAN supply 400 amps to start the car, an incandescent brake lamp or 10 mA light a LED (usually a resistor in series with a LED). The "constant" is voltage.
  3. DickCappels


    Aug 21, 2008
    Welcome to the forum, Ben Cawley!

    Said another way, current, I = E/R, so the current through each resistor is a function of the voltage across it and the resistance. Note the use of the terms through and across are different from the usage in your first post.