Recent content by jperentosh

  1. J

    Circuit with two batteries and three resistors - Find current

    Homework Statement Find the current through R1, R2, and R3 for the attached diagram. Homework Equations Ohm's Law V=IR I=V/R etc.
  2. J

    Ohm's Law, Resistance, and Power

    How so? They're each 10 ohms.
  3. J

    Ohm's Law, Resistance, and Power

    Homework Statement Please look at the attachment. Homework Equations ΔV=I*R R=ΔV/I Power=I*ΔV The Attempt at a Solution I said that ΔV of A and ΔV of B are the same (each 3/2 V). Using this, I got that the current at A = 3/20 Amps. However, this means that the current at B...
  4. J

    High School How does positive charge spread out in conductors?

    I know that when there are excess positive charges in a conductor, for example, a metal sphere, the positive charges will spread out over its surface. However, I am confused about how this excess charge spreads out over the surface, if protons cannot move and only electrons can move. Can...
  5. J

    High School Why won't the lightbulb light up in this circuit?

    First, please look at the attached image. Would the lightbulb light up? Why or why not? (I thought that the lightbulb would not light up, but I didn't know why.)
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    High School How does a battery-powered light bulb work?

    In a battery-powered light bulb, what is happening in the light bulb that makes it light up? To understand what I mean by a battery-powered bulb, visit this link: http://science.howstuffworks.com/innovation/everyday-innovations/how-to-make-battery-powered-light-bulb.htm Thanks!
  7. J

    Undergrad Distribution of positive charge in conductors

    In conductors, how does the excess of positive charge distribute itself across the surface of the material?
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    High School Number of electrons when something is charged

    When something is charged, is the number of excess electrons a large or small number when compared to the total number of atoms?