UTPA STEM/CBI Courses/Physics (Calculus Based)/Faraday's Law

Course Title: Physics for Scientists and Engineers

Lecture Topic: Faraday's Law of Electromagnetic Induction: Electromagnetism

Instructor: Professor Muhammad Bhatti

Institution: UTPA

Backwards Design

Course Objectives

Primary Objectives- By the next class period students will be able to:
- What is Faraday's Law? What do you think?
- Faraday stated that:
  - Whenever a magnetic force increases or decreases, it produces electricity;
  - the faster it increases or decreases, the more electricity it produces.
  - The voltage induced in the wire or conductor is proportional to the rate of change of the magnetic flux (how quickly the magnetic field is changing). In other words, the faster the magnetic field is changing, the larger the voltage that is induced will be; or, the faster the wire is moving through the magnetic field, the larger the induced voltage will be.
  - This is the basis for how electric motors and electric generators work!
- Explain the concepts of the Faraday’s law of Electromagnetic Induction
- Know how to apply the law in various situations and real world problems
- Solve problems that require the application of Faraday’s law

Sub Objectives- The objectives will require that students be able to:
- Understand basic mathematical manipulations and have some integration background
- Identify situations where Faraday’s law is at work
- Lenz's Law
- Lenz's law is a basic law in electromagnetic theory for determining the direction of flow of induced currents (see Faraday's Law of Induction). It was first stated by the Estonian physicist Heinrich Lenz (1804-65).
- According to Lenz's law, when a current is caused to flow in an electrical conductor by a change in the external magnetic field surrounding the conductor, the direction of flow of the current is such as to produce a magnetic field opposing the original change in the external magnetic field.

Difficulties- Students may have difficulty:
- Understanding the concept of induced emf and chaning magnetic field
- How is induced current produced in the closed loop?
- Why relative motion of either closed loop or permanent magnet is required?

Real-World Contexts- There are many ways that students can use this material in the real-world, such as:
- Motors, Generators, etc.Dancing Hearts
- Application of Antenna, metal detectors, etc.

Model of Knowledge

Concept Map
- Electromagnetism
- Permanent magnet
- Movement of magnet or coil
- Induced current

Content Priorities
- Enduring Understanding
  - Understand connection between permanent magnet and induced current
  - Understand how Faraday’s law can be used to produce electricity
  - Understand principle of motor and generators

Assessment of Learning

Formative Assessment
- In Class (groups)
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- Homework (individual)
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Summative Assessment
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OBJECTIVE

By the next class period, students will be able to:

The objectives will require that students be able to:

THE CHALLENGE

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GENERATE IDEAS

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MULTIPLE PERSPECTIVES

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RESEARCH & REVISE

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TEST YOUR METTLE

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GO PUBLIC

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