SHS1 Applied Technology · Semester 1 Week 19: Electrical Systems Design

Lesson notes

Learning Objectives

Indicator: 1.3.1.LI.3 - Apply the concept of power transmission and distribution in electricity supply.

By the end of the lesson, learners can:

Calculate voltage drop and power loss along a transmission line using the formula P = I²R, and interpret the results in relation to Ghana’s national grid.
Simulate a simplified power transmission and distribution network using VPLab software, tracing energy flow from generation to a domestic consumer.
Design a small distribution layout (generator to substation to homes) and justify the voltage levels chosen at each stage.
Identify and explain the consequences of illegal connections on the distribution network, using evidence from videos and calculations.
Present group findings on transmission efficiency, demonstrating strategic reasoning about economic and safety trade-offs in electricity supply.

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Curriculum details

Strand: Electrical and Electronic Technology (Strand 3)
Sub-strand: Electrical Systems Design (3.1)
Content standard: 1.3.1.CS.1 - 1.3.1.CS.1 Demonstrate knowledge and understanding of power transmission and distribution and its associated safety 1.3.1.LO.1 Outline clearly, safety principles to follow in the use of electricity; analyse the key steps in power transmission and link it to power distribution to other substations, homes and industries.
Indicator: 1.3.1.LI.3 - Apply the concept of power transmission and distribution in electricity supply.
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. 45

Exemplars (from the NaCCA curriculum)

Experiential Learning:
- Demonstrate using videos, the consequences of overloading the distribution network through illegal connections.
- Engage learners in mixed ability or mixed gender groups to simulate power distribution and transmission networks using VPlab software and videos and present their findings. NB:
1. Special needs students should be given more time to finish a task.
2. During presentations, make sure that everyone is encouraged to speak on behalf of the groups, regardless of background, such as gender, physical capabilities, or intellectual ability.
3. Any individual can be chosen as the group's leader.

Assessment (1.3.1.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning; Level 4 Extended critical thinking and reasoning.

Teaching and Learning Materials:
- Overcoat
- Goggles
- hand gloves
- protective shoes
- fire extinguishers
- computers installed with VPLab, multism and circuit wizard software.