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Republic of The Philippines Pablo Borbon Main II, Batangas City WWW - Batstate-U.edu - PH Tel. No. (043) 425-0139 Loc. 118

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Republic of the Philippines

BATANGAS STATE UNIVERSITY


Pablo Borbon Main II, Batangas City
College of Engineering, Architecture & Fine Arts
www.batstate-u.edu.ph Tel. No. (043) 425-0139 loc. 118

ELECTRONICS, INSTRUMENTATION & CONTROL AND MECHATRONICS


ENGINEERING DEPARTMENT

EE 425-CIRCUITS 2

LABORATORY EXPERIMENT NO. 2


PARALLEL RC AND RL CIRCUITS

LOPEZ, JAYSON A.
18-08793
ICE- 2201

ENGR. JONAS S. DE CASTRO

INSTRUCTOR

FEBRUARY 18, 2020


Introduction

AC Circuit seems have a more complex conception when it comes to connections and
solving the electrical elements. But through this activity, we will be able to unravel and
familiarize its field firstly with the series of the RC and RL circuits. It will also teach us to
describe the relationship between current and voltage in the aforementioned series connections,
as well as to measure and know its impedance using necessary measuring instruments.
For the parallel of RC Circuits or Resistor-Capacitor circuit, is an electric circuit
composed of resistors and capacitors driven by voltage and/or current source. For its simplest
type, it is just consisted of one capacitor, one resistor and a source. Furthermore, when this
circuit is connected to an AC voltage source, the voltage drop in a parallel RC circuit are the
same as in every other parallel circuit, and hence, they are equal. We have an applied voltage and
that voltage is equally applied across the resistor and across the capacitor. As we all know, a
capacitor can store energy while a resistor controls the rate at which it charges or discharges. For
the impedance of the RC circuit, enter the capacitance, the resistance and the frequency, select
the units of measurements and the result for RC impedance will be shown in ohms and for the
phase difference in degrees.
On the other hand, RL Circuits or Resistor-Inductor circuit, is one of the simplest
analogue infinite impulse response electronic filters. It is composed primarily of a resistor and an
inductor that is also driven by a voltage source in parallel. In RL circuit, our analysis technique
this time is that we will apply the rules of parallel circuits. This approach is fundamentally the
same as for DC. The voltage is shared uniformly by all components. For the total impedance, it
can be calculated by using Ohm’s Law (Z=E/I). Also, it can be calculated by using a reciprocal
formula identical to that used in calculating parallel resistance.
RC and RL circuits are nothing more than applications for resistors, inductors, and
capacitors. It might have a challenging connections to be able to function properly, this activity
taught us more about the conceptions and ideas of the RC and RL circuits.
PARALLEL RC CIRCUIT
Measured Values

IT = 0.65 A IR = 0.45 A IC = 0.45 A

ET = 220 V ER = 220 V EC = 220 V


PARALLEL RL CIRCUIT
Measured Values

IT = 0.68 A IR 0.45 A IL = 0.45A

ET = 220 V ER = 120 V EL = 160 V


Analysis

The current and voltage drop across each element were almost the same. The computed
and measured value for the impedance of RC and RL parallel circuit has a large value of percent
difference.

Circuit Design
1. Design a parallel RC Circuit which consists of capacitor C and a 220V, 100W. The total
impedance of the circuit is 454.6712 ohms. Find the value of R and C.

A. R=?

Z = 454.6712 Ω

V 220
It =   0.4839 A
Z 454.6712

V 2 220 2
R 
P 100
R  484

B. C=?

 1   1   1 

    
 Z   R    jX C 
 1   1   1 

  
 454.6712   484    jX C 
X C  7503.23491
 1 
  
 2fC 
C  0.3535F
Problems
1. A coil having an impedance of 10+j5 is connected in parallel with a series combination of a
variable resistance R and a capacitor having a reactance of 8 ohms. The combination is
connected across a 24-V AC source. Determine the total current drawn if R is adjusted in order
to bring the total of the circuit to unity.

2. Three impedances Za, Zc, Zr are connected in parallel. If at 60Hz, Za=0+j8, Zc=0-j2, and
Zr=5+j0 ohms. Solve for the frequency at resonance.
Conclusion

Through this activity, it helps me to widen my conception and idea about the AC circuit
connection especially about the RC and RL parallel connection. I am now already familiarized
myself about the subject matter. As we have described carefully the relationship between current
and voltage, I have attained more knowledge about the parallel connection. Also their impedance,
respective capacitive reactance and inductive reactance. Moreover, we have learned how to
compute their values manually, and using multisim application which is a big help for us to
check if we obtain the correct answer and measure. All in all, we have now the knowledge and
idea about connecting capacitor and inductor in an AC parallel circuit connection.

Recommendation

In this activity, I recommend check first the wires and the terminals needed in circuit
trainer if its working fine before proceeding to the actual connections. Also, ask first the
instructor or laboratory technician how to use the trainer to avoid accidents by pressing or
turning any unnecessary switches. Moreover, read carefully the activity’s procedure before going
to laboratory proper. Strictly follow the instructions given by the circuit itself to avoid destroying
the fuse of the circuit trainer. Create a light atmosphere when working with your groupmates to
ease the activity and finish it on time.
DOCUMENTATION

RC Circuit Connection

ITOTAL IR

IC ETOTAL
ER EC

RL Circuit Connection

ITOTAL IR
IL ETOTAL

ER EL

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