Chapter 27 Circuits In this chapter we will cover the following topics: -Electromotive force (emf) -Ideal and real emf devices -Kirchhoff’s loop rule -Kirchhoff’s.

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Presentation transcript:

Chapter 27 Circuits In this chapter we will cover the following topics: -Electromotive force (emf) -Ideal and real emf devices -Kirchhoff’s loop rule -Kirchhoff’s junction rule -Multiloop circuits -Resistors in series -Resistors in parallel -RC circuits, charging and discharging of a capacitor (27 – 1)

A cylindrical copper rod has resistance R. It is reformed to three times its original length with no change of volume. Its new resistance is: A. R B. 3R C. 9R D. R/9 E. R/3

pump High (+) reservoir Low (-) reservoir (27 – 2)

(27 – 3)

V i Ideal emf device V i Real emf device (27 – 4)

(27 – 5)

R i motion R i (27 – 6)

(27 – 7)

(27 – 8)

i V (27 – 9)

(27 – 10)

(27 – 11)

(27 – 12)

(27 – 13)

(27 – 14)

+ - i (27 – 15)

(27 – 16)

+ - i q t qoqo O (27 – 17)

In the diagram R1 > R2 > R3. Rank the three resistors according to the current in them, least to greatest. A. 1, 2, 3 B. 3, 2, 1 C. 1, 3, 2 D. 3, 1, 3 E. All are the same

A. 5 ΩB. 7 ΩC. 2 ΩD. 11 ΩE. NOT

I. In the diagram, the current in the 3-resistor is 4A. The potential difference between points 1 and 2 is: A. 0.75V B. 0.8V C. 1.25V D. 12V E. 20V