Chap_1_Solut_Dorf

Chap_1_Solut_Dorf - Chapter 1 Electric Circuit Variables...

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Chapter 1 – Electric Circuit Variables Exercises Ex. 1.2-1 ( ) 2 2 3 2 3 0 0 0 8 4 A 8 8 ( ) (0) (8 4 ) 0 2 2 C 3 3 t t t i t t t q t i d q d t t τ τ τ τ τ τ = = + = + = = 2 Ex. 1.2-2 ( ) 4sin3 12cos3 A dq d i t t t dt dt = = = Ex. 1.3-1 i 1 = 45 μ A = 45 × 10 -6 A < i 2 = 0.03 mA = .03 × 10 -3 A = 3 × 10 -5 A < i 3 = 25 × 10 -4 A Ex. 1.5-1 (a) The element voltage and current do not adhere to the passive convention in Figures 1.5-1 B and 1.5-1 C so the product of the element voltage and current is the power supplied by these elements. (b) The element voltage and current adhere to the passive convention in Figures 1.5-1 A and 1.5-1 D so the product of the element voltage and current is the power delivered to, or absorbed by these elements. (c) The element voltage and current do not adhere to the passive convention in Figure 1.5-1 B , so the product of the element voltage and current is the power delivered by this element: (2 V)(6 A) = 12 W. The power received by the element is the negative of the power delivered by the element, -12 W. (d) The element voltage and current do not adhere to the passive convention in Figure 1.5-1 B , so the product of the element voltage and current is the power supplied by this element: (2 V)(6 A) = 12 W. (e) The element voltage and current adhere to the passive convention in Figure 1.5-1 D , so the product of the element voltage and current is the power delivered to this element: (2 V)(6 A) = 12 W. The power supplied by the element is the negative of the power delivered to the element, -12 W. 1-1
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