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Announcements

Announcements. EXAM 2 on Tuesday, March 18! Homework for tomorrow… ( Ch. 31, Probs. 44, 45, & 46) CQ8: V bat = ε /(1+r/R), as R increases, V bat increases 31.10 : 2.4 x 10 -5 m 31.17: 3.2% 31.42: 0.38 W Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am

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Announcements

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  1. Announcements • EXAM 2 on Tuesday, March 18! • Homework for tomorrow… (Ch. 31, Probs. 44, 45, & 46) CQ8: Vbat= ε/(1+r/R), as R increases, Vbat increases 31.10: 2.4 x 10-5 m 31.17: 3.2% 31.42: 0.38 W • 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 (Parallel Resistors & Resistor Circuits)

  3. Review… Equivalent resistor for resistors in parallel…

  4. Quiz Question 1 The battery current I is • 3 A. • 2 A. • 1 A. • 2/3 A. • 1/2 A.

  5. Quiz Question 2 When the switch closes, the battery current • increases. • stays the same. • decreases.

  6. Quiz Question 2 When the switch closes, the battery current • increases. • stays the same. • decreases. Notice: The equivalent of several resistors in parallel is always less than any single resistor in the group.

  7. i.e. 31.8:A parallel resistor circuit The three resistors of the figure below are connected to a 9V battery. Find the potential difference across and the current through each resistor.

  8. i.e. 31.9:A combination of resistors What is the equivalent resistance of the group of resistors shown in the figure below? 10Ω 25Ω 90Ω 45Ω

  9. Quiz Question 3 Consider the circuit below, where the switch is open. The current is the same through bulbs A and B, and they are equally bright. Bulb C is not glowing. The switch is now closed, what happens to the brightness of B? • It increases. • It decreases. • It stays the same.

  10. Voltmeters… • are used to measure potential differences. • Must be wired in parallel with the circuit element whose voltage is to be measured. • Rvoltmeter~∞ Ω

  11. i.e. What is the internal resistance of the battery in the figure below?

  12. 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.

  13. 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

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