Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Circuits containing multiple elements Series and parallel combinations RC circuits Electricity in the nervous system Chapter 23 Circuits Topics: Sample question: An electric eel can develop a potential difference of over 600 V. How do the cells of the electric eel’s body generate such a large potential difference? Slide 23-1

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Reading Quiz 1.The bulbs in the circuit below are connected_________. A.in series B.in parallel Slide 23-2

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. 1.The bulbs in the circuit below are connected_________. B.in parallel Slide 23-3 Answer

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Reading Quiz 3.When three resistors are combined in series the total resistance of the combination is A.greater than any of the individual resistance values. B.less than any of the individual resistance values. C.the average of the individual resistance values. Slide 23-6

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. 3.When three resistors are combined in series the total resistance of the combination is A.greater than any of the individual resistance values. Slide 23-7 Answer

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Drawing Circuit Diagrams Slide 23-8

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Checking Understanding The following circuit has a battery, two capacitors and a resistor. Which of the following circuit diagrams is the best representation of the above circuit? Slide 23-9

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. The following circuit has a battery, two capacitors and a resistor. Which of the following circuit diagrams is the best representation of the above circuit? Slide Answer

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Kirchhoff’s Laws Slide 23-11

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Using Kirchhoff’s Laws Slide 23-12

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. The diagram below shows a segment of a circuit. What is the current in the 200 resistor? A.0.5 A B.1.0 A C.1.5 A D.2.0 A E.There is not enough information to decide. Slide Clicker Question

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. The diagram below shows a segment of a circuit. What is the current in the 200 resistor? B.1.0 A Slide Answer

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. The diagram below shows a circuit with two batteries and three resistors. What is the potential difference across the 200 resistor? A.2.0 V B.3.0 V C.4.5 V D.7.5 V E.There is not enough information to decide. Slide Clicker Question

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. The diagram below shows a circuit with two batteries and three resistors. What is the potential difference across the 200 resistor? A.2.0 V Slide Answer

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Series Resistors Slide 23-17

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Parallel Resistors Slide 23-18

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. There is a current of 1.0 A in the circuit below. What is the resistance of the unknown circuit element? What is the current out of the battery? Slide 23-19

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Example Problem 1.In the circuit shown below, rank in order, from most to least bright, the brightness of bulbs A–E. Explain. Slide 23-42

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Example Problem 2.In the circuit shown below: A.Rank in order, from most to least bright, the brightness of bulbs A–D. Explain. B.Describe what, if anything, happens to the brightness of bulbs A, B, and D if bulb C is removed from its socket. Explain. Slide 23-41

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Example Problem 3.Compare the brightness of a 40 W bulb and a 25 W bulb Which would be brighter in parallel? Which would be brighter in series? A.The 25 W bulb B.The 40 W bulb C.They are equally bright Slide 23-41

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Analyzing Complex Circuits Slide 23-20

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. What is the equivalent resistance of the following circuit? Find the current in and the potential difference across each element in the following circuit. Slide 23-21

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Household Electricity Slide 23-22

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. The following devices are plugged in to outlets on the same 120 V circuit in a house. This circuit is protected with a 15 A circuit breaker. DevicePower Computer250 W Heater900 W Lamp100 W Stereo120 W Is there too much current in the circuit—does the circuit breaker blow? Slide 23-23