# lect11 - Physics 227 Lecture 11 Circuits KVL KCL Meters •...

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Unformatted text preview: Physics 227: Lecture 11 Circuits, KVL, KCL, Meters • Lecture 10 review: • EMF ξ is not a voltage V, but OK for now. • Physical emf source has V ab = ξ- Ir internal . • Power in a circuit element is P = IV. • For a resistor with V = IR, P = IV = I 2 R = V 2 /R. • Light bulbs are rated in Watts, for ¡xed V over them. • Higher power bulbs have lower resistance, do brightness of bulbs in series is opposite brightness of bulbs in parallel. Monday, October 17, 2011 Definitions • A node or junction: a place where 2 or more wires meet. Often shown in drawings as a solid circle. • Elements (resistors, capacitors, ...) in parallel: elements between the same two notes, necessarily have the same voltage over them. • Elements in series: elements connected with a wire, with no nodes between them, so that they necessarily have the same current through them. E 1 E 2 Node E 1 and E 2 in parallel E 2 E 1 E 1 and E 2 in series Definitions • A node or junction: a place where 2 or more wires meet. Often shown in drawings as a solid circle. • Elements (resistors, capacitors, ...) in parallel: elements between the same two notes, necessarily have the same voltage over them. • Elements in series: elements connected with a wire, with no nodes between them, so that they necessarily have the same current through them. E 1 E 2 Node E 1 and E 2 in parallel E 2 E 1 E 1 and E 2 in series Monday, October 17, 2011 Resistor iClicker A. R1 is in parallel with R2. B. R1 is in parallel with R3. C. R2 is in parallel with R3. D. R1 is in series with R2 and/or R3. E. R2 is in series with R3. Which of the following is true about the circuit shown?...
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lect11 - Physics 227 Lecture 11 Circuits KVL KCL Meters •...

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