PHY2049_05-27-11 - What is the equivalent resistance...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
5/27/2011 1 Phy2049 Circuits have capacitors and resistors. Capacitors in parallel in series Resistors in parallel in Series Kirchhof’s two rules: voltage around the loop and currents at a junction. P = iV = i 2 R = v 2 /R 2 1 C C C eq + = 2 1 1 1 1 C C C eq + = 2 1 R R R eq + = 2 1 1 1 1 R R R eq + = A.5 Ω B.7Ω C.2Ω D.11 E. NOT What is the equivalent resistance between points 1 and 2. You measure the current through the 4Ω wire and find it to be 3A. What is the potential difference between points 1 and 2? A.12 V B. 30V C. 15V D. 20V E. NOT Consider the circuit shown in the figure. We assume that the emf device is ideal and that the connecting wires have negligible resistance. A current flows through the c i Current in a single loop circuit ircuit in the clockwise direction. In a time interval a charge passes through the circuit. The battery is doing work . Using energy conservation we can set this amount of work equal to the rate at which heat is dt dq idt dW dq idt = = = E Ei i 2 generated on R. Kirchhoff put the equation above in the form of a rule known as Kirchhoff's l 0 oop rule (KLR for short) idt Ri dt
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

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