Applications of Electronics · SHS3 Physics

Lesson notes

Learning Objectives

Indicator: 3.3.4.LI.2 - Design a NPN amplifier.

By the end of the lesson, learners can:

Identify the three terminals of an NPN transistor and state their functions in a common-emitter amplifier circuit.
Compare and contrast input and output signal waveforms in terms of amplitude, using a simulation or oscilloscope display.
Calculate the voltage gain of an NPN amplifier given input and output voltage values (Gain = Vout / Vin).
Construct a working NPN amplifier circuit on a breadboard or in simulation software, correctly biasing the base with a voltage divider network.
Justify the choice of component values (RC, RE, R1, R2) for a given supply voltage and desired gain.

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Curriculum details

Strand: Electric Field, Magnetic Field and Electronics (Strand 3)
Sub-strand: Applications of Electronics (3.4)
Content standard: 3.3.4.CS.2 - Demonstrate knowledge and understanding of signal amplification. 3.3.4.LO.2 Using a transistor explain how amplification is done.
Indicator: 3.3.4.LI.2 - Design a NPN amplifier.
Suggested placement: Semester 2, Week 14 (Week 34 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 194

Exemplars (from the NaCCA curriculum)

Collaborative learning: Using simulations and multimedia, let learners watch a video/simulation of how an NPN amplifier is built.
Provide equitable access to resources and opportunities.
Assessment (3.3.4.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 4 Extended critical thinking and reasoning.
Teaching and Learning Resources:
- Audio-visuals
- Internet
- Projectors
- YouTube
- Reference books
- Flash cards
- Field trips or visits