Planning Index: Electrical Principles & Technologies | Print |

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

  • forms of energy
  • energy storage
  • energy transformation
  • energy transmission
  • generation of electrical energy
  • measures and units of electrical energy
  • electric charge and current
  • electrical resistance and Ohm's law
  • circuits
  • renewable and nonrenewable energy

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.

What do the students already know?

What science principles are involved in electricity?
How is electricity generated and used, wisely?

What must they Learn?

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..


Specific Learner Outcomes

Instructional Focus

Focus 1

Energy Conversion

Investigate and interpret the use of devices to convert various forms of energy to electrical energy, and electrical energy to other forms of energy


- 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

Text / Research

Lab Activities

Demonstrations / Lab Activities
Lab activities

Making Models

Focus 2

Electrical Technologies

Describe technologies for transfer and control of electrical energy


- 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

Electrical Safety Mini-Unit
Lab Activities

Lab Activities
Demonstrations / Lab Activities
Lab Activities

Text / Research

Problem Solving Challenges / Troubleshooting
Scientific Illustrations
Comparative Chart

Focus 3

Input/Output Efficiency

Identify and estimate energy inputs and outputs for example devices and systems, and evaluate the efficiency of energy conversions.


- 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

Text / Lab Activities


Lab Activities
Energy Awareness / Project

Focus 4

Using Electrical Energy

Describe and discuss the societal and environmental implications of the use of electrical energy


- alternative sources
- by-products and potential impacts
- electrical technologies

( benefits and impacts )
- sustainability of energy use

Lab Activities
Questioning / Problem Solving

Lab Activities
Problem Solving Activities
Building Models