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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