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Announcements

Announcements. EXAM 2 on Tuesday, March 18! Homework for tomorrow… ( Ch. 31, Probs . 26, 59, & 60) CQ10: a) A > B = C since I A > I B = I C b) B & C go out since I B = I C = 0, A gets brighter since I A increases . 31.20: 11 Ω 31.22: 24 Ω Office hours… MW 12:30-1:30 pm

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Announcements

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  1. Announcements • EXAM 2 on Tuesday, March 18! • Homework for tomorrow… (Ch. 31, Probs. 26, 59, & 60) CQ10: a) A > B = C since IA > IB =IC b) B & C go out since IB = IC= 0, A gets brighter since IAincreases. 31.20: 11 Ω 31.22: 24 Ω • Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am • Tutorial Learning Center (TLC) hours: M 8-1 pm, 3-6 pm, W 8-1 pm, 2-6 pm TR 8-6 pm, F 8-2 pm

  2. Chapter 31 Fundamentals of Circuits (Resistor Circuits & Getting Grounded)

  3. Resistor Circuits • Draw a circuit diagram, labeling all known quantities. • Reduce circuit to the smallest possible number of equivalent resistors. • Write Kirchoff’s loop rule for each loop and Kirchoff’s junction rule for each junction. • Solve the equations and check your results.

  4. i.e. 31.10:Analyzing a complex circuit Find the current through and the potential difference across each of the four resistors in the circuit shown below. 600Ω 400Ω 12V 800Ω 560Ω

  5. Quiz Question 1 The light bulbs are identical. Initially both bulbs are glowing. What happens when the switch is closed? • Nothing. • A stays the same; B gets dimmer. • A gets brighter; B stays the same. • Both get dimmer. • A gets brighter; B goes out.

  6. i.e. 31.11:Analyzing a two-loop circuit Find the current through and the potential difference across the 100Ω resistor in the circuit below. 300Ω 100Ω 200Ω 19V 12V

  7. 31.8:Getting Grounded • If we connect one point of a circuit to the earth by an ideal wire, we can agree to call potential of this point to be that of the earth: Vearth = 0 V. • Under normal circumstances, there is ZERO current in the grounding wire. • Grounding allows us to have specific values for the potential at each point in the circuit.

  8. i.e. 31.12:A grounded circuit Suppose the circuit of the figure below is grounded at the junction between the two resistors instead of at the bottom. Find the potential at each corner of the circuit. 8Ω 10V 12Ω

  9. Quiz Question 2 What does the voltmeter read? • 6 V. • 3 V. • 2 V. • Some other value. • Nothing because this will fry the meter.

  10. Quiz Question 3 What does the ammeter read? • 6 A. • 3 A. • 2 A. • Some other value. • Nothing because this will fry the meter.

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