Saving and Compound Interest
Students will understand the power of compound interest and explore different savings vehicles.
Key Questions
- Explain the concept of compound interest and its long-term impact.
- Analyze the incentives for early saving and investment.
- Compare different savings accounts and their suitability for various goals.
Ontario Curriculum Expectations
About This Topic
Electromagnetism explores the deep connection between electricity and magnetism, a discovery that revolutionized the modern world. Students investigate how a current-carrying wire creates a magnetic field and how a changing magnetic field can induce an electric current (Faraday’s Law). This topic is the heart of the Ontario curriculum's study of motors, generators, and transformers.
From the massive generators at the Sir Adam Beck station in Niagara to the wireless chargers on our nightstands, electromagnetism is the engine of our society. This topic bridges the gap between invisible fields and mechanical motion. Students grasp this concept faster through hands-on modeling where they build their own electromagnets and simple DC motors.
Active Learning Ideas
Inquiry Circle: The Strongest Electromagnet
Groups compete to build the strongest electromagnet using a nail, wire, and a D-cell battery. They must systematically vary the number of coils and the current to see which has the greatest effect on the number of paperclips lifted, then graph their results.
Stations Rotation: Induction Exploration
Stations include: 1. Moving a magnet through a coil connected to a galvanometer, 2. Using a hand-crank generator to light a bulb, 3. Dropping a magnet through a copper pipe (Lenz's Law). Students must identify the direction of the induced current in each case.
Think-Pair-Share: The Wireless Charging Mystery
Students are asked to explain how a phone can charge without being 'plugged in.' They must use the terms 'primary coil,' 'secondary coil,' and 'changing magnetic field' to explain the process of induction to a partner.
Watch Out for These Misconceptions
Common MisconceptionA stationary magnet inside a coil will produce a current.
What to Teach Instead
Induction requires a *changing* magnetic field. Only when the magnet is moving (or the field is turning on/off) will a current flow. A 'live' demo with a galvanometer where the needle only jumps during the move is the best way to prove this.
Common MisconceptionMagnetic fields and electric fields are the same thing.
What to Teach Instead
While related, they are distinct. Electric fields come from charges; magnetic fields come from *moving* charges (current). Peer discussion about the 'Right Hand Rules' helps students keep the directions and causes of these fields separate in their minds.
Suggested Methodologies
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Frequently Asked Questions
How does electromagnetism power Ontario's electric trains?
What is Lenz's Law and why does it matter?
What are the best hands-on strategies for teaching magnetic induction?
How can active learning help students understand the Right Hand Rules?
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