⚡ Unit 8 — Paper 1

Unit 8 — Electrical and Electronic Principles

Unit 8 covers the electrical and electronic systems that power modern engineering. From basic circuit theory to the components inside control systems and consumer electronics, this unit builds your ability to analyse circuits, understand how electronic components behave, and apply electrical principles to real engineering problems. Whether you go into manufacturing, automation or product design, electrical knowledge is increasingly essential.

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Some topics covered in this unit

DC circuit theory — Ohm's law, Kirchhoff's voltage and current laws, series and parallel circuits

AC circuits and waveforms — frequency, peak and RMS values, impedance and phase relationships

Electronic components — resistors, capacitors, inductors, diodes, transistors and their circuit behaviour

Power and energy — electrical power, energy consumption and efficiency in circuits

Sensors and signal conditioning — how sensors produce electrical signals and how those signals are processed

Digital electronics — logic gates, truth tables, binary numbers and basic digital systems

Sample question

DC Circuit Theory

Three resistors of 2 Ω, 4 Ω and 6 Ω are connected in series to a 12 V supply. What is the total current in the circuit?

6 A

0.5 A

1 A

2 A

✓ Correct answer: C — 1 A. In a series circuit, total resistance = 2 + 4 + 6 = 12 Ω. Using Ohm's Law: I = V ÷ R = 12 ÷ 12 = 1 A. The same current flows through all components in a series circuit.