Electricity and Electronics · JHS3 Science

Lesson notes

Learning Objectives

Indicator: B9.4.2.2.1 - Describe forward bias and reverse bias and explain the relationship among the components, such as: LEDs, Diodes, Resistors and Capacitors, in an electronic circuit.

By the end of the lesson, learners can:

Define forward bias and reverse bias in their own words, stating what happens to current flow in each condition.
Construct a simple forward bias circuit with an LED, resistor and battery, and a reverse bias circuit, and correctly predict which one lights the LED.
Explain the role of a resistor in protecting an LED from excessive current, and describe how the brightness of the LED changes as the resistance value is changed.
Explain the role of a capacitor in an electronic circuit by observing and describing what happens when a capacitor is connected in forward and reverse bias conditions.
Communicate their findings from the circuit construction clearly, using correct scientific vocabulary, both in small-group discussion and in a short written report.

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Curriculum details

Strand: Forces and Energy (Strand 4)
Sub-strand: Electricity and Electronics (4.2)
Content standard: B9.4.2.2 - Demonstrate an understanding of Forward and Reverse Bias and explain the behaviour of LEDs, Diodes, Resistors and Capacitors in electronic circuits
Indicator: B9.4.2.2.1 - Describe forward bias and reverse bias and explain the relationship among the components, such as: LEDs, Diodes, Resistors and Capacitors, in an electronic circuit.
Suggested placement: Term 2, Week 10 (Week 22 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: Science, Common Core Programme (JHS1-JHS3), 2023, p. 109
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

1. Explain forward bias and reverse bias in an electronic circuit.
2. Construct different electronic circuits (the forward and reverse bias), and observe what happens to the LED.
3. Construct different electronic circuits involving resistors and capacitors and observe what happens to the LED and report on their findings.