Mapleham Study — Chapter 4

Chapter 4 — Key Takeaways

Active Devices — control charge flow and amplify, unlike passive components
Diode and Zener — one-way anode-to-cathode conduction; Zener uses reverse breakdown for regulation
BJT and FET — base current controls BJT; gate voltage controls FET
Triode — grid voltage controls cathode-to-plate electron flow; used for high-power RF
Resistor Colour Code — first two bands are digits, third is multiplier, fourth is tolerance