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Construction And Testing Of Series Rl Module For A.C Circuit Measurement

Download the complete project materials on Construction And Testing Of Series Rl Module For A.C Circuit Measurement from chapter one to chapter five with references


The RL module was constructed using a combination of values for resistors and inductors. The module was tested by measuring the current and voltage of the three circuits that were connected with varying frequency. The results and graphs plotted showed that resonance occurs at frequencies of 2500HZ, 1500HZ  and 1500 HZ for R = 470𝛀, L = 0.1mH; R = 220𝛀, L = 1.0mH and R = 1000 𝛀, L = 10.0mH respectively. The workability of the module is justified by the nature of the result and graphs obtained.



An RL module is an electrical circuit consisting of a resistor (R), and inductor (L) connected in series or in parallel. The name of the circuit is derived from the leters that are used to denot the constituent components of the circuit, where the sequence of the components may vary from RL. This circuit forms a harmonic oscillator for current, and resonated in a similar way as an RLC circuit. Introducing the resistor also reduces the peak resonant frequency. Some resistance is unavoidable in real circuit even if a resistor is not specifically included as a component. An ideal, pure LC circuits is a abstraction used in theoretical considerations.

RL circuits may have applications as an oscillator circuit. Radio receivers and Television sets use for turning to select a narrow frequency range from ambient radio waves. In this role the circuit is often referred to as a tunned circuit. An RL circuit can be used as a band-pass filter, band-stop filter, low pass filter or high pass filter.

The turning application, for instance is an example of a band-pass filtering. The LR filter is described as a second-order circuit in the circuit, meaning that any voltage or current in the circuit, meaning that any voltage or current in the circuit ca be described by a second order differentiate equation in circuit analysis. (, 2002).


RL circuit is a multipurpose circuit that can be used for a wide variety of purpose and functions. But sometimes due to difficulties in working with individual components such as resistors and inductors indeed, it is more easier to work with a joint circuit that is made up of the two components. Indeed, it is a lot tedious to debug the circuit and confirm whether the circuiting is creating a problem or the individual components are not functioning well.

This problem has motivated the choice of this project which aims at designing and implementing simple device to test for A.C circuit that would aid students in carrying out experiments related to the device and to avoid their project work as well.


There are various methods involved in the construction of RL module, but the most commonly used method are the RL module in series and in parallel. Both methods, differs from each other in their mode of construction.

It is cheaper and easier to construct RL module in series but, in the case of RL module is parallel, more money is spent and it’s usually more complex. However, the point of interest is the RL module in series, its mode of operation, areas of application, as well as its advantages and disadvantages.



To construct a series RL module for practical application


In order to attain the aim of this project, the objectives are:

  1. a) To construct the RL module using selected combination of resistors and inductors which can be connected in series.
  2. b) To fix terminals on the module so as to provide means of connections for the series connections.
  3. c) To test the modules using voltmeter and ammeter in order to obtain practical results for the purpose of laboratory uses for A.C circuit analysis.



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