Notes_Circuits GS 2012_13_ Answer Key

Come up with your own scenario that shows a

This preview shows page 24 - 25 out of 25 pages.

Come up with your own scenario that shows a relationship between multiple paths compared to one in order to explain series vs. parallel circuits.
Image of page 24

Subscribe to view the full document.

Page | 25 Resistivity The resistance of a wire is proportional to the length of the wire and inversely proportional to the thickness of the wire. The temperature and the material of the wire will also play a role in how fast or slow a current can flow. R = Resistance ρ = Resistivity l = length of wire A = Area of wire You can think of how resistance changes within a circuit, and relate it to how people travel through hallways. A Thick Wire (large cross-sectional area) is similar to a wide hallway, while a thin wire would be a smaller hallway. Humans would rather walk down the wide hallway because travel is easier, similar to how current travels down the path with least resistance. A Long Wire would be similar to a long hallway to walk down, while a short wire would be like a short hallway. Humans would rather walk down the shorter hallway because they are able to reach their destination quicker and easier. A Hot Wire would be similar to a hallway on a summer day with excited students moving about, while a cold hallway would be found in the winter time with students sitting bundled up and not moving around much. If a person walked down the hot hallway, they would have more people in their way to say “Hi” to, causing them to take longer to mak e it through the hallway. Critical Thinking Questions 1. Why are thick wires rather than thin wires usually used to carry large current? Thick wires have less resistance so you can have more current travel through the wire. The reason there is less resistance is because there is a lot of room for the current to travel through since there is a larger cross section. 2. Could the same length of a copper and aluminum wire have the same resistance? Explain. Yes, the same length of copper and aluminum could have the same resistance because you could vary the thickness of the wire to make the overall resistance come out to the same answer. 3. Compare the Resistances of the following: a. Thick Wire vs. Thin Wire The thin wire has more resistance because it has less room for the current to travel through. b. Long Wire vs. Short Wire The long wire has more resistance because it has more distance for the current to travel through. c. Hot Wire vs. Cool Wire The hot wire has more resistance because the particles inside are moving around more compared to the cold wire, causing more collisions. d. Series Circuit vs. Parallel Circuit The Resistance in a series circuit is higher than a parallel circuit that uses the same resistors. Note: This equation is just for background information and is not necessary for you to know. A l R
Image of page 25
  • Fall '12
  • Beatty
  • Charge, Current, Resistor, Electrical resistance, Series and parallel circuits, Bulb

{[ snackBarMessage ]}

Get FREE access by uploading your study materials

Upload your study materials now and get free access to over 25 million documents.

Upload now for FREE access Or pay now for instant access
Christopher Reinemann
"Before using Course Hero my grade was at 78%. By the end of the semester my grade was at 90%. I could not have done it without all the class material I found."
— Christopher R., University of Rhode Island '15, Course Hero Intern

Ask a question for free

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern