Explore the fundamentals of power zener diodes and their application as voltage regulators in this comprehensive 31-minute electronics tutorial. Delve into a detailed circuit analysis, examining the relationship between zener voltage and diode current flow. Learn how zener diodes maintain stable output voltage despite power source fluctuations and understand the impact of load resistance on their performance. Discover the method for calculating the optimal current-limiting resistor value to maximize circuit efficiency. Gain practical insights into voltage divider circuits, higher voltage scenarios, and power dissipation considerations for a well-rounded understanding of zener diode applications in electronic circuits.