RC CIRCUIT
http://goo.gl/6vOUIR
In the field of electronics, there are
different types of circuit elements which are combined to produce desirable
output to different gadgets and appliances. One of the combinations of the
circuit elements is the RC circuit (resistor- capacitor circuit). RC circuit is
known to be the combination of resistors and capacitors in a circuit. It would
give the best output because it characterizes the function of resistor and
capacitor. Resistors regulate the flow of current and voltage in the circuit
while capacitor can store energy. This is the reason why when the two are
combined they could give advantages in a circuit. When the resistance of
resistors and the capacitance of capacitors are multiplied, the product is the
time constant. It has a unit of second.
The formula representation is shown below.
http://goo.gl/XMlImS
The formula representation is shown below.
http://goo.gl/XMlImS
As we all know, capacitors are charged and discharged. In RC circuits, it goes the same way.
The formula for the current in charging and discharging
can be seen in the derivation.
http://goo.gl/6oUk0K
For Charging
http://goo.gl/JGs80T
For discharging
http://goo.gl/JGs80T
http://goo.gl/JGs80T
Applications
of RC circuit
RC circuits are widely applied to
different devices because of its ability to control time. It is used as timers
because it can charge and discharge at s specific rate of time. It can be used
at home, automobiles, modernized doors, windows and many others. It is used in
computers for timing.
Experimentation
RESISTOR-CAPACITOR CIRCUIT
I. OBJECTIVES:
a. To develop an understanding for the
behavior of RC circuit.
b. To understand the concept of a time
constant and use it to find the capacitance
c. To be able to analyze non-linear data
II. MATERIALS: Power Supply
Alligator clips
3-way switch Resistors
Capacitor
III. PROCEDURES:
1. Set-up the circuit as shown below.
2. Charge the capacitor for 20 seconds
and take its voltage in every 5 seconds.
3. Set another 20 seconds to discharge
it and take again its voltage in every 5 seconds.
4. Replace the 1800Ω resistor with
5600Ω.
5. Repeat procedures 2 and 3 but this
time have 60 seconds instead of 20 seconds for charging and discharging.
6. Record your data using a table and then
graph.
RESULTS & DISCUSSIONS:
Table 1:
C = 4700µF
R= 1800Ω
Time (s)
|
Charging (V)
|
Discharging (V)
|
5
|
4.0
|
4.0
|
10
|
6.0
|
2.4
|
15
|
7.4
|
1.4
|
20
|
9.0
|
0.8
|
OBSERVATIONS:
I observed that in charging, as time
increases, the voltage increases while discharging is opposite.
Table 2:
C = 4700µF
R= 5600Ω
Time (s)
|
Charging (V)
|
Discharging (V)
|
5
|
1.6
|
6.4
|
10
|
2.8
|
5.4
|
15
|
3.8
|
4.6
|
20
|
4.6
|
3.8
|
25
|
5.5
|
3.2
|
30
|
6.0
|
2.6
|
35
|
6.5
|
2.2
|
40
|
6.8
|
1.9
|
45
|
7.2
|
1.6
|
50
|
7.5
|
1.3
|
55
|
7.7
|
1.1
|
60
|
7.9
|
0.9
|
I
observed that increasing the time increases the charges in charging while
discharging is in contrast.
V. Graph
Charging for 20 seconds :
V. Graph
Charging for 20 seconds :
x
|
y
|
5
|
0.81
|
10
|
0.41
|
15
|
0.2
|
20
|
0
|
Discharging for 20 seconds :
x
|
y
|
5
|
0.59
|
10
|
0.31
|
15
|
0.17
|
20
|
0.09
|
 |
Charging for 60 seconds:
x
|
y
|
5
|
1.6
|
10
|
1.04
|
15
|
0.73
|
20
|
0.54
|
25
|
0.38
|
30
|
0.28
|
35
|
0.2
|
40
|
0.15
|
45
|
0.1
|
50
|
0.05
|
55
|
0.03
|
60
|
0
|
Discharging for 60 seconds:
x
|
y
|
5
|
1.66
|
10
|
1.15
|
15
|
0.87
|
20
|
0.66
|
25
|
0.52
|
30
|
0.4
|
35
|
0.33
|
40
|
0.28
|
45
|
0.23
|
50
|
0.18
|
55
|
0.15
|
60
|
0.12
|
GENERALIZATION:
In
general, combination of different circuit elements can trigger desirable output
because their characteristics are combined to form a new one..
References
Retrieved on September 6, 2015 fromhttp://goo.gl/6vOUIR
Retrieved on September 6, 2015 from http://goo.gl/6oUk0K
Retrieved on September 6, 2015 fromhttp://goo.gl/JGs80
Retrieved on September 6, 2015 from http://goo.gl/6oUk0K
