Direct Current · SHS3 Physics

Lesson notes

Learning Objectives

Indicator: 3.3.1.LI.2 - Express Ohm’s law and its relationship to electrical resistance; ohmic and non ohmic conductors

By the end of the lesson, learners can:

State Ohm’s law in words and in mathematical form (V = IR) and identify the relationship between voltage, current, and resistance in an electrical circuit.
Perform a simple experiment using an ammeter, voltmeter, resistor, and rheostat to collect voltage and current data and verify the relationship described by Ohm’s law.
Plot a voltage-current (V-I) graph from experimental data and use it to determine the resistance of a conductor from the slope.
Distinguish between ohmic and non-ohmic conductors by analysing their V-I graphs and give at least two everyday examples of each type.
Solve numerical problems involving V = IR to calculate voltage, current, or resistance in simple direct current circuits, including power calculations using P = VI.

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Curriculum details

Strand: Electric Field, Magnetic Field and Electronics (Strand 3)
Sub-strand: Direct Current (3.1)
Content standard: 3.3.1.CS.1 - Demonstrate an understanding of current electricity and its related quantities. 3.3.1.LO.1 Using the knowledge on current electricity to solve problems involving resistance and power in electrical circuits.
Indicator: 3.3.1.LI.2 - Express Ohm's law and its relationship to electrical resistance; ohmic and non ohmic conductors
Suggested placement: Semester 1, Week 19 (Week 19 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. 173

Exemplars (from the NaCCA curriculum)

Experiential learning: Using ammeter, voltmeter, standard resistor, rheostat/resistance box, connecting wires and a key, learners should perform an experiment to show the relationship between voltage and current.
Provide equitable access to resources and opportunities.
Assessment (3.3.1.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
- Interactive laboratory
- Connecting virtual wires
- Ammeter
- Galvanometer
- Voltmeter
- Resistance
- Rheostats box