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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
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Learning Outcome 1: Apply an understanding of fundamental electrical quantities to evaluate circuits with constant voltages and currents.
Answer: An understanding of fundamental electrical quantities such as voltage, current, resistance, and power enables the evaluation of circuits operating with constant (DC) voltages and currents. By applying Ohm's Law, Kirchhoff's laws, and basic circuit principles, learners can analyze how electrical energy flows through components, determine voltage drops, calculate current values, and assess power consumption. This knowledge helps in designing, testing, and troubleshooting simple DC circuits used in everyday electrical and electronic systems.
Learning Outcome 2: Evaluate circuits with sinusoidal voltages and currents.
Answer: Evaluating circuits with sinusoidal voltages and currents involves understanding alternating current (AC) principles, including frequency, amplitude, phase angle, and waveform characteristics. Using concepts such as impedance, reactance, and phasor diagrams, learners can analyze how resistors, capacitors, and inductors behave in AC circuits. This enables accurate calculation of current, voltage, and power in systems such as household electrical supplies, motors, and communication equipment.
Learning Outcome 3: Describe the basis of semiconductor action, and its application to simple electronic devices.
Answer: The basis of semiconductor action lies in the electrical properties of materials such as silicon and germanium, which can be modified through doping to create p-type and n-type regions. When these regions are joined, they form devices such as diodes and transistors that control the flow of electric current. These components are fundamental to simple electronic devices, enabling functions such as rectification, amplification, and switching in circuits used in power supplies, radios, and digital systems.
Learning Outcome 4: Explain the difference between digital and analogue electronics, describing simple applications of each.
Answer: Digital electronics deals with signals that have discrete values, usually represented as binary states (0 and 1), while analogue electronics works with continuously varying signals. Analogue systems are commonly used in applications such as audio amplifiers, radios, and sensors, where signals change smoothly. In contrast, digital systems are used in computers, calculators, and mobile devices, where information is processed in numerical form. Understanding this difference helps learners select appropriate technologies for specific practical applications.
Scenario:
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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Task 1
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).
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Task 2
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:
Determine :
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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Task 3
a. Demonstrate the action of the following semiconductor devices.
i. Diode
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.
Task 4
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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