SHS1 Applied Technology · Semester 1, Week 18
Electrical Systems Design
Lesson notes
Learning Objectives
Indicator: 1.3.1.LI.2 - Describe the process of electrical Power Transmission and distribution.
By the end of the lesson, learners can:
- Trace the journey of electrical power from the generating station through transmission lines to distribution substations and finally to homes and industries, naming each stage in the correct order.
- State the typical transmission voltages used in Ghana (132 kV, 275 kV, 400 kV) and the common distribution voltages (33 kV, 11 kV, 415/240 V), matching each voltage to its application.
- Explain why power is transmitted at high voltages, citing the reduction of power losses as the main reason.
- Describe the equipment found at a distribution substation and explain the function of at least three of these items.
- Identify the key institutions responsible for power transmission (GRIDCo) and distribution (ECG, NEDCO) in Ghana.
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Sign in with phone numberCurriculum 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.2 - Describe the process of electrical Power Transmission and distribution.
- Suggested placement
-
Semester 1, Week 18
(Week 18 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. 44
Exemplars (from the NaCCA curriculum)
Experiential Learning and Collaborative Learning: - Engage learners in mixed ability groupings and use the Google search Engine and the YouTube to undertake the following activities and do group presentation on their findings: List typical transmission voltages e.g., 132kv, 275kv, 400kv and distribution voltages in Ghana and state the application of each e.g., 33KV, 11KV, 415/240V - State the advantages and disadvantages of High voltage transmission e.g., losses are minimized NB: 1. learners with special needs should be given more time to complete a given task. 2. During presentations, ensure that anyone regardless of the background i.e., gender, physical abilities or intellectual abilities is encouraged to present on behalf of the groups. 3. Any person at all can be selected as a leader of a group. Experiential Learning: Embark on a field trip to any of the energy providers (ECG or NEDCO) to have a look at their substations in other to: 1. Describe a distribution substation and list some equipment at the substation 2. Describe the systems of distributing power in Ghana e.g., single phase, 3-phase 3. Explain the consequences of illegal power connections cautioning leaners to be patriotic enough to avoid illegal connection. 4. List companies responsible for power transmission (e.g.,GRIDCo) and those responsible for power distribution in Ghana 5. List companies responsible for power distribution in Ghana e.g. ECG, NEDCO Assessment (1.3.1.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding; 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.