A 10-V battery is connected to a 15- resistor and an unknown resistor R, as shown. The current in the circuit is 0.40 A. How much heat is produced in the 15- resistor in 2.0 min?
a.
0.40 kJ
b.
0.19 kJ
c.
0.29 kJ
d.
0.72 kJ
e.
0.80 kJ
[Ques. 2] If R1 = 3.0 , R2 = 6.0 , R3 = 12 , and I = 0.50 A, at what rate is heat being generated in R1?
a.
20 W
b.
17 W
c.
12 W
d.
31 W
e.
6.0 W
[Ques. 3] What is the equivalent resistance between points a and b?
a.
14
b.
8.0
c.
6.0
d.
25
e.
40
[Ques. 4] What is the equivalent resistance between points a and b?
a.
14
b.
8.0
c.
6.0
d.
25
e.
40
[Ques. 5] What is the equivalent resistance between points a and b when R = 12 ?
a.
20
b.
16
c.
24
d.
28
e.
6.0
[Ques. 6] What is the equivalent resistance between points a and b when R = 30 ?
a.
27
b.
21
c.
24
d.
18
e.
7.5
[Ques. 7] What is the equivalent resistance between points a and b when R = 13 ?
a.
29
b.
23
c.
26
d.
20
e.
4.6
[Ques. 8] A capacitor in a single-loop
RC circuit is charged to 85 of its final potential difference in 2.4 s. What is the time constant for this circuit?
a.
1.5 s
b.
1.3 s
c.
1.7 s
d.
1.9 s
e.
2.9 s
[Ques. 9] At t = 0 the switch S is closed with the capacitor uncharged. If C = 30 F, = 50 V, and R = 10 k, what is the potential difference across the capacitor when I = 2.0 mA?
a.
20 V
b.
15 V
c.
25 V
d.
30 V
e.
45 V
[Ques. 10] At t = 0 the switch S is closed with the capacitor uncharged. If C = 40 F, = 50 V, and R = 5.0 k, how much energy is stored by the capacitor when I = 2.0 mA?
a.
20 mJ
b.
28 mJ
c.
32 mJ
d.
36 mJ
e.
40 mJ
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