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Essential idea: The majority of electricity generated throughout the world is generated by machines that were designed to operate using the principles of electromagnetic induction.
Nature of science:
Experimentation: In 1831 Michael Faraday, using primitive equipment, observed a minute pulse of current in one coil of wire only when the current in a second coil of wire was switched on or off but nothing while a constant current was established. Faraday’s observation of these small transient currents led him to perform experiments that led to his law of electromagnetic induction. (1.8)
Understandings:
Electromotive force (emf)
Magnetic flux and magnetic flux linkage
Faraday’s law of induction
Lenz’s law
Applications and skills:
Describing the production of an induced emf by a changing magnetic flux and within a uniform magnetic field
Solving problems involving magnetic flux, magnetic flux linkage and Faraday’s law
Explaining Lenz’s law through the conservation of energy
Guidance:
Quantitative treatments will be expected for straight conductors moving at right angles to magnetic fields and rectangular coils moving in and out of fields and rotating in fields
Qualitative treatments only will be expected for fixed coils in a changing magnetic field and ac generators
Data booklet reference:
Theory of knowledge:
Terminology used in electromagnetic field theory is extensive and can confuse people who are not directly involved. What effect can lack of clarity in terminology have on communicating scientific concepts to the public?
Utilization:
Applications of electromagnetic induction can be found in many places including transformers, electromagnetic braking, geophones used in seismology, and metal detectors
Aims:
Aim 2: the simple principles of electromagnetic induction are a powerful aspect of the physicist’s or technologist’s armoury when designing systems that transfer energy from one form to another
Resources:
Resources:
In- Class Activities:
In- Class Activities:
Faraday's Law - Falling Magnets
Faraday's Law - Magnet on a spring
Lenz's Law - Magnetic Dampening (eddy currents)
Lenz's Law - Falling Magnets
Energy Conservation Discussion
Problem Solving:
Problem Solving:
EM Induction TSPs - Solutions
Concept Checks:
Concept Checks:
Readings:
Readings:
Kognity - Chapter 11.1: Electromagnetic Induction - Use your ACS Login
OpenStax - Induced EMF and Magnetic Flux
OpenStax - Faraday's Law of Induction and Lenz
Video Resources:
Video Resources:
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