PHY2049_05-27-11

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

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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

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