WJEC A Level Electronics ET5 — Unit Papers & Mark Schemes

ET5 questions often present a complete electronic system and ask you to analyse its operation. Practise breaking systems into functional blocks (input, processing, output, feedback) and explaining the role of each block. When given a system schematic, trace the signal path from input to output, describing the transformation at each stage. Microcontroller questions test your understanding of programming concepts in the context of embedded systems. Know the function of common peripherals (ADC, PWM, timers, serial communication) and be able to write or interpret pseudocode for typical tasks: reading a sensor, controlling a motor, or responding to a switch input. Focus on the logical structure of the program rather than language-specific syntax. Communication systems questions require understanding of amplitude modulation, frequency modulation, and their relative merits. Know how bandwidth relates to signal quality, how the signal-to-noise ratio affects system performance, and how multiplexing allows multiple signals to share a single channel.