SHS1 Engineering · Semester 2 Week 7: Energy Efficiency and Conservation

Lesson notes

Learning Objectives

Indicator: 1.2.3.LI.4 - Compute and interpret energy consumption from nameplates.

By the end of the lesson, learners can:

Apply the formula Energy (kWh) = Power (kW) × Time (h) to compute the energy consumption of equipment using data extracted from nameplates.
Convert power ratings given in watts (W) to kilowatts (kW) correctly before computing energy consumption.
Calculate energy consumption for different time periods (30 minutes, 1 hour, 2 hours, and daily totals) from a single nameplate data set.
Interpret computed energy values by comparing the energy use of different appliances and discussing practical implications for energy conservation.
Present and defend their computations in whole-class discussion, responding respectfully to feedback from peers.

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Curriculum details

Strand: Energy Systems (Strand 2)
Sub-strand: Energy Efficiency and Conservation (2.3)
Content standard: 1.2.3.CS.1 - Develop the skill to measure, estimate, and analyse energy production and consumption in renewable energy systems. 1.2.3.LO.1 Use various instruments to measure electrical and non-electrical quantities in renewable energy systems. 1.2.3.LO.2 Estimate and interpret energy consumption of electrical and mechanical equipment.
Indicator: 1.2.3.LI.4 - Compute and interpret energy consumption from nameplates.
Suggested placement: Semester 2, Week 7 (Week 27 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. 46

Exemplars (from the NaCCA curriculum)

Problem-based Learning: Learners are provided nameplates of equipment and asked to write down power, voltage, current, power factor, etc. Learners compute power (if not available) and energy over given periods, say 30 minutes, 1 hour, 2 hours, etc. Learners discuss the computations with the whole class. Encourage them to tolerate criticism and respect the views of other people.

Assessment (1.2.3.AS.4). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning.

Teaching and Learning Resources:
- Projector
- Laptops and assorted instruments used to measure electrical and non-electrical quantities in renewable energy systems.
- Installed renewable energy systems and assorted instruments used to measure electrical and non-electrical quantities in renewable energy systems.
- Nameplates (actual or photographs) of equipment.