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Qualification - Higher National Certificate in Electrical and Electronics Engineering
Unit Name - Electrical and Electronic Principles
Assignment Title - Electrical and Electronic Fundamentals
Unit Number - Unit 19
Learning Outcome 1: Apply an understanding of fundamental electrical quantities to evaluate circuits with constant voltages and currents.
Learning Outcome 2: Evaluate circuits with sinusoidal voltages and currents.
Learning Outcome 3: Describe the basis of semiconductor action, and its application to simple electronic devices.
Learning Outcome 4: Explain the difference between digital and analogue electronics, describing simple applications of each.
You are presented with the following tasks by the company where you train. The electric network company must carry out these tasks within a specified time limit and most importantly with the highest of standards and proficiency. To prove to the company that you are the right person to work for it you must carry out these tasks with utmost efficiency and professionalism and within the specified time limit. All the tasks involve solving AC and DC networks using the theory and practical experiences you acquired in your modules. All the tasks must be handed in one report which must be clearly and professionally presented.
LO1 Apply an understanding of fundamental electrical quantities to analyse Circuits with constant voltages and currents.
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a. Apply and plot ohms law and determine the slope of an I-V curve (Refer to the lab experiment dc on ohm's law in Appendix A)
b. Apply Kirchhoff's voltage and current laws to analyse the circuit in the experiment (refer to lab experiment dc on Kirchhoff's voltage and current laws in Appendix A).
c. Validate Kirchhoff's laws against the practical results obtained in task1 b
d. Evaluate Thevenin's theorem through simulations and through theory (refer to lab experiment dc on Thevenin theorem and maximum power transfer in Appendix A).
a. R L series circuit (fig1)
An inductor of 80mH is connected in series with 100ohms resistor. If a sinusoidal current of 20 mA at 50Hz flows in the circuit:
i. The impedance of the circuit
ii. The current in the circuit
iii. Voltage dropped across the resistor
iv. Voltage dropped across the inductor
v. the phase angle
b) A series circuit comprises an inductor of 80 mH, a resistor of 200 ? and a capacitor of 22 uF. If a sinusoidal current of 40mA at 50hz flows in the circuit of fig 1,
Critically analyse the operation of the circuit and determine :
i. Voltage dropped across the resistor
ii. Voltage dropped across the capacitor
iii. Voltage dropped across the inductor
iv. The impedance of the circuit
v. The supply voltage
vi. The current in the circuit
vii. the phase angle
and Draw phasor diagram for the RLC AC circuit in fig 2
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a. Demonstrate the action of the following semiconductor devices.
ii. Zener diode
iii. Transistor as switch
b. Describe and evaluate range of discrete semiconductor devices in terms of simple semiconductor theory, suggesting appropriate applications
c. Critically evaluate the performance of Bipolar and FET transistors in terms of simple semiconductor theory, suggesting appropriate applications for each.
a. Explain the difference between digital and analogue electronics. Illustrate your answer with examples.
b. Explain the amplifier characteristics in term of gain, bandwidth, input and output resistance and distortion level.
c. Explain the operation of the circuit in figure 3 and determine practically the Truth table for the following combinational logic gates circuit in Fig 3.
c. Name the logic function of the combinational logic gate circuit in fig 3.
d. Explain the relative applications of both analogue and digital electronics
e. Critically evaluate the applications of analogue and digital electronics in Audio systems.
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