Q1. In the adjacent figure each of the two capacitors mounted in parallel has a value C, the resistor has a value R, and the power supply has value ɛ = 25 V. Upon closing the key S the charging process of the two capacitors starts. The initial value of the electric current was Io = 25 mA, as shown in the table below, then the electric current decreased until it vanished at t = ∞. The table below shows the values of the electric C R current every two seconds as measured by the ammeter A. t (s) 0 2 4 6 8 10 12 14 16 18 I (mA) 25 20 16 13 10 8 7 5 4 3 q (mC) 40 55 66 75 89 97 a) Determine the value R of the resistor in kQ units. b) Plot the I-t graph (electric current versus time). c) Determine the circuit constant time t from the I-t graph.

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Q1. In the adjacent figure each of the two capacitors mounted in parallel has a value C,
the resistor has a value R, and the power supply has value ɛ = 25 V. Upon closing the
key S the charging process of the two capacitors starts. The initial value of the electric
current was Io = 25 mA, as shown in the table below, then the electric current
decreased until it vanished at t = 00. The table below shows the values of the electric
current every two seconds as measured by the ammeter A.
t (s)
6 8
2
4
10
12
14
16
18
I (mA)
q (mC)
25
20
16
13
10
7
4
40
55
66
75
89
97
a) Determine the value R of the resistor in kQ units.
b) Plot the I-t graph (electric current versus time).
c) Determine the circuit constant time t from the I-t graph.
d) Determine the value C of each capacitor in µF units.
e) Complete the table by evaluating the electric charge q(t) on each
capacitor at the moments t = 2,12, 16, oo,
ww
Transcribed Image Text:Q1. In the adjacent figure each of the two capacitors mounted in parallel has a value C, the resistor has a value R, and the power supply has value ɛ = 25 V. Upon closing the key S the charging process of the two capacitors starts. The initial value of the electric current was Io = 25 mA, as shown in the table below, then the electric current decreased until it vanished at t = 00. The table below shows the values of the electric current every two seconds as measured by the ammeter A. t (s) 6 8 2 4 10 12 14 16 18 I (mA) q (mC) 25 20 16 13 10 7 4 40 55 66 75 89 97 a) Determine the value R of the resistor in kQ units. b) Plot the I-t graph (electric current versus time). c) Determine the circuit constant time t from the I-t graph. d) Determine the value C of each capacitor in µF units. e) Complete the table by evaluating the electric charge q(t) on each capacitor at the moments t = 2,12, 16, oo, ww
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