1.5 Assume that a 20 V voltage drop occurs across an element from terminal 2 to terminal 1 and that a current of 4 A enters terminal 2. a) Specify the values of v and i for the polarity references shown in Fig. 1.6(a)–(d). b) State whether the circuit inside the box is absorbing or delivering power. c) How much power is the circuit absorbing? Answer: (a) Circuit 1.6(a): v = -20 V, i = -4 A; circuit 1.6(b): v = -20 V, i = 4 A; circuit 1.6(c): v = 20 V, i = -4 A; circuit 1.6(d): v = 20 V, i = 4 A; %3D %3D (b) absorbing; (с) 80 W. 1 + 1 2 (а) р %3D vi (b) р %3D — vi 1 1 2 (c) p = - vi (d) р %3D vi

1.5 Assume that a 20 V voltage drop occurs across an element from terminal 2 to terminal 1 and that a current of 4 A enters terminal 2. a) Specify the values of v and i for the polarity references shown in Fig. 1.6(a)–(d). b) State whether the circuit inside the box is absorbing or delivering power. c) How much power is the circuit absorbing? Answer: (a) Circuit 1.6(a): v = -20 V, i = -4 A; circuit 1.6(b): v = -20 V, i = 4 A; circuit 1.6(c): v = 20 V, i = -4 A; circuit 1.6(d): v = 20 V, i = 4 A; %3D %3D (b) absorbing; (с) 80 W. 1 + 1 2 (а) р %3D vi (b) р %3D — vi 1 1 2 (c) p = - vi (d) р %3D vi

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter7: Electricity

Section: Chapter Questions

Problem 26Q: (Indicates a review question, which means it requires only a basic understanding of the material to...

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Question

100%

1.5
Assume that a 20 V voltage drop occurs across
an element from terminal 2 to terminal 1 and
that a current of 4 A enters terminal 2.
a) Specify the values of v and i for the polarity
references shown in Fig. 1.6(a)–(d).
b) State whether the circuit inside the box is
absorbing or delivering power.
c) How much power is the circuit absorbing?
Answer: (a) Circuit 1.6(a): v = -20 V, i = -4 A;
circuit 1.6(b): v = -20 V, i = 4 A;
circuit 1.6(c): v = 20 V, i = -4 A;
circuit 1.6(d): v = 20 V, i = 4 A;
(b) absorbing;
(c) 80 W.
1
+2
(а) р %3D vi
(b) р — — vi
•1
2
(с)р %3D — vi
(d) р %3D vi
Figure 1.6 A

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