All Flashcards
What are the differences between generators and transformers?
Generators: Convert mechanical energy to electrical energy. | Transformers: Change the voltage of alternating current.
Compare increasing vs. decreasing magnetic flux regarding induced magnetic field direction.
Increasing Flux: Induced field opposes the applied field. | Decreasing Flux: Induced field is in the same direction as the applied field.
What is the difference between Faraday's Law and Lenz's Law?
Faraday's Law: Quantifies the induced EMF based on the rate of change of magnetic flux. | Lenz's Law: Determines the direction of the induced EMF, opposing the change in flux.
Compare increasing vs. decreasing flux regarding induced magnetic field.
Increasing Flux: Induced magnetic field points opposite to the applied field. | Decreasing Flux: Induced magnetic field points in the same direction as the applied field.
Compare primary and secondary coils in a transformer.
Primary Coil: Creates a changing magnetic flux when AC voltage is applied. | Secondary Coil: Experiences induced EMF due to changing flux from the primary coil.
What is Magnetic Flux (Φ)?
The amount of magnetic field passing through a given area.
What is Faraday's Law?
A changing magnetic flux through a loop of wire induces an electromotive force (emf).
What is Lenz's Law?
The induced emf always creates a current that produces a magnetic field opposing the change in the magnetic flux that caused it.
Define induced EMF.
The electromotive force generated in a circuit due to a changing magnetic field.
What is an area vector?
A vector perpendicular to the surface, pointing outward from a closed surface.
Define induced current.
The current that flows in a circuit due to an induced EMF, opposing the change in magnetic flux.