1. Please take 30 seconds to register your free account to remove most ads, post topics, make friends, earn reward points at our store, and more!  
    TalkBass.com has been uniting the low end since 1998.  Join us! :)

Wiring circuits in parallel confusion

Discussion in 'Pickups & Electronics [BG]' started by Jamerman, Dec 3, 2013.

  1. Jamerman


    Apr 8, 2013
    I'm very new to electronics, but in knowing Ohms law from school (I=V/R) you know as resistance goes up, (if voltage is constant) current must decrease. And to work out the total resistance in a series circuit, you add the resistance of each component together.

    So when you wire them in a parallel circuit, you use reciprocals of the resistance (So the equation is 1/Total resistance=1/ResistorA + 1/ResistorB, etc). But going by this logic, a bigger resistor would equal a bigger current (Because obviously 1/2 > 1/3).

    Can anyone explain why this is?
  2. 1 Amp of current through a 1 Volt potential difference equates to 1 Ohm of resistance. Assuming constant voltage, if resistance decreases, current increases. Two 1 Ohm resistances in parallel is 0.5 Ohms. Two 1A currents in parallel is 2A. By Ohm's law, V=I*R, and thus 1A*1 Ohm=2A*0.5 Ohms=1V
  3. Crater


    Oct 12, 2011
    Dallas, TX area
    You haven't finished the equation by mathematically inverting ("1/x") your answer.

    Yes, 1/2 is greater than 1/3, but when they're inverted, 3 is greater than 2. More resistance (in ohms) means less current flowing at the same voltage.
  4. Jamerman


    Apr 8, 2013
    Ah thank you, I guess I just worked out the reciprocals wrong :)