All Flashcards
Label the parts of a transformer.
1: Primary Coil, 2: Secondary Coil, 3: Core
Label the components in a motional EMF setup.
1: Magnetic Field (B), 2: Moving bar with velocity (v), 3: Length of the bar (l)
Define Electromagnetic Induction.
Generating a voltage using magnetic fields; if in a complete circuit, it creates a current.
Define Magnetic Flux.
A measure of the amount of magnetic field lines passing through a given area. ΦB = ∫ B ⋅ dA
Define Faraday's Law.
A change in magnetic flux induces an electromotive force (EMF). ε = -N (dΦB/dt)
Define Lenz's Law.
The induced EMF always opposes the change in magnetic flux that caused it.
Define Motional EMF.
EMF generated by moving an object in a magnetic field. ε = Blv
Define Weber (Wb).
The SI unit of magnetic flux, equivalent to Tm².
What is the difference between Faraday's Law and Lenz's Law?
Faraday's Law: Quantifies the induced EMF. | Lenz's Law: Determines the direction of the induced EMF (opposes change in flux).
Compare voltage step-up and step-down transformers.
Step-Up: More loops on the secondary side. | Step-Down: More loops on the primary side.