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Planning Index: Electrical Principles & Technologies |
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Grade 9 Science Unit Plan
Unit D - Electrical Principles and Technologies
(Science and Technology emphasis)
Grade 9 Unit Overview (Alberta)
Electricity provides the means to energize many devices, systems and processes that are part of our technological
environment. Electrical devices are used to transfer and transform energy, to provide mechanisms for control and
to transmit information in a variety of forms. In this unit, students learn the principles that underlie electrical
technologies, by studying the form and function of electrical devices and by investigating ways to transfer, modify,
measure, transform and control electrical energy. Using a problem-solving approach, students create and modify
circuits to meet a variety of needs. Students also develop skills for evaluating technologies, by comparing alternative
designs and by considering their efficiency, effectiveness and environmental impact.
Concepts Covered and Developed through Instruction
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- generation of electrical energy
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- measures and units of electrical energy
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- electric charge and current
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- electrical resistance and Ohm's law
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- renewable and nonrenewable energy
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This unit builds on ideas introduced in Grade 8, Unit D: Mechanical Systems, and introduces
ideas that will be developed further in Science 10, Unit B: Energy Flow in Technological Systems, and in Science
30 Unit C: Electromagnetic Energy.
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What do the students already know?
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What science principles are involved in electricity?
How is electricity generated and used, wisely?
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What must they Learn?
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The electrical principles that underlie electrical technologies by
studying the form and function of electrical devices, as well as, investigating ways to transfer, modify, measure,
transform and control electrical energy, efficiently and wisely..
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General
Learner
Outcome
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Specific Learner Outcomes
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Instructional Focus
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Focus 1
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Energy Conversion
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Investigate and interpret the use of devices to convert various forms
of energy to electrical energy, and electrical energy to other forms of energy
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1.0
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- chemical, thermal (heat) and electrical energy
- energy transfer and transformation
- chemical storage cells
- transforming mechanical energy into electrical energy and electrical energy into mechanical energy
- modify the design of an electrical device
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Text / Research
Lab Activities
Demonstrations / Lab Activities
Lab activities
Making Models
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Focus 2
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Electrical Technologies
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Describe technologies for transfer and control of electrical energy
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2.0
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- potential dangers
- static and current electricity
- conductors and insulators
- resistance
- switches and resistor devices
- nature of electrical current
- Ohm's law
- troubleshoot circuits
- circuit diagrams
- microelectronic circuits
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Electrical Safety Mini-Unit
Lab Activities
Lab Activities
Demonstrations / Lab Activities
Lab Activities
Text / Research
Calculations
Problem Solving Challenges / Troubleshooting
Scientific Illustrations
Comparative Chart
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Focus 3
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Input/Output Efficiency
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Identify and estimate energy inputs and outputs for example devices
and systems, and evaluate the efficiency of energy conversions.
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3.0
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- forms of energy input and output in devices
- units, measures and devices
- conservation of energy
- efficiency
- energy inputs and outputs
- reducing wastage of electrical energy
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Text / Lab Activities
Calculations
Challenges
Calculations
Lab Activities
Energy Awareness / Project
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Focus 4
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Using Electrical Energy
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Describe and discuss the societal and environmental implications
of the use of electrical energy
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4.0
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- alternative sources
- by-products and potential impacts
- electrical technologies
( benefits and impacts )
- sustainability of energy use
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Lab Activities
Questioning / Problem Solving
Lab Activities
Problem Solving Activities
Building Models
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