Unit 19 Electrical and Electronic Principles Assignment Sample UK

Unit 19 Electrical and Electronic Principles is a fundamental module in UK-based electrical engineering courses. It covers essential principles such as Ohm’s Law, Kirchhoff’s Laws, AC and DC circuits, circuit analysis techniques, and electronic components. Students learn about voltage, current, resistance, capacitance, and inductance, along with their practical applications in circuits.

This unit provides a solid foundation for understanding complex electrical and electronic systems, preparing students for further study or employment in various fields such as power generation, telecommunications, and electronics design.

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Assignment Brief 1: Explain Ohm’s Law and provide an example of its application in a circuit.

Assignment Brief 2: Describe the concept of capacitance and how it affects electrical circuits.

Solution:

Capacitance is the ability of a system to store an electrical charge. It is measured in farads (F). A capacitor is a passive two-terminal electrical component that stores energy in an electric field.

Capacitance affects electrical circuits by influencing the flow of current. When a voltage is applied across a capacitor, it charges up, and current flows into the capacitor until it reaches its maximum charge. Once charged, a capacitor resists changes in voltage, leading to various effects in circuits such as filtering, timing, and energy storage.

Assignment Brief 3: Explain the difference between AC (alternating current) and DC (direct current) electrical systems.

Solution:

AC (Alternating Current):

AC is an electrical current that periodically reverses direction. It is commonly used in household electrical outlets and is generated by power stations. The voltage and current in an AC system vary sinusoidally with time. AC systems are suitable for long-distance power transmission due to their ability to be easily stepped up or down in voltage using transformers.

DC (Direct Current):

DC is an electrical current that flows in one direction only. It is commonly used in batteries and electronic devices. The voltage and current in a DC system remain constant over time. DC systems are generally simpler in design compared to AC systems but are less suitable for long-distance power transmission.

Assignment Brief 4: Discuss the significance of Kirchhoff’s Laws in analysing electrical circuits and provide an example of their application.

Solution: Kirchhoff’s Laws are fundamental principles used in analysing electrical circuits:

1. Kirchhoff’s Current Law (KCL) states that the total current entering a junction in a circuit is equal to the total current leaving the junction. Mathematically, it can be represented as ΣI_in = ΣI_out.

2. Kirchhoff’s Voltage Law (KVL) states that the total voltage around a closed loop in a circuit is equal to the sum of the voltage drops within the loop. Mathematically, it can be represented as ΣV_loop = 0.

Example:

Consider a simple circuit consisting of a voltage source connected in series with two resistors. Applying Kirchhoff’s Laws, we can analyse the circuit:

• Using KCL, the current flowing through the circuit must be the same at any given point. Therefore, the current flowing through the resistors is the same as the current supplied by the voltage source.

• Using KVL, the sum of the voltage drops across the resistors must equal the voltage supplied by the source. This helps in determining the voltage across each component in the circuit.

Assignment Brief 5: Describe the operation of a bipolar junction transistor (BJT) and its applications in electronic circuits.

Solution:

A bipolar junction transistor (BJT) is a three-terminal semiconductor device consisting of three layers of semiconductor material. The operation of a BJT involves the control of current flow between two terminals (collector and emitter) by a third terminal (base). BJTs are of two types: NPN and PNP.

In an NPN transistor:

• When a small current is applied to the base terminal, it controls the larger current flowing from the collector to the emitter terminals.

• By varying the base current, the collector-emitter current can be controlled, making BJTs suitable for amplification and switching applications in electronic circuits.

Applications of BJTs include:

Amplification:

BJTs are commonly used in audio amplifiers, RF amplifiers, and other signal processing circuits.

Switching:

BJTs can be used as switches in digital circuits, where they control the flow of current based on the voltage applied to the base terminal.

Oscillation:

BJTs are used in oscillator circuits to generate periodic signals for applications such as clock generation and radio frequency transmission.

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