All Flashcards
Label the primary and secondary sides of a transformer.
Primary Side: Input voltage | Secondary Side: Output voltage
Define Electromagnetic Induction.
Generating a voltage using magnetic fields. If this voltage is in a complete circuit, it creates a current.
What is Magnetic Flux?
A measure of the amount of magnetic field lines passing through a given area, calculated as .
Define Faraday's Law.
The induced EMF in any closed circuit is equal to the negative of the time rate of change of the magnetic flux through the circuit: .
What is 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 (like a conducting rod) in a magnetic field.
What is a Weber (Wb)?
The SI unit of magnetic flux, equivalent to Tm².
What is the effect of increasing the number of loops in a coil on the induced EMF?
The induced EMF increases proportionally (ε = -N (dΦB/dt)).
What happens when a magnet is moved towards a conducting loop?
The magnetic flux through the loop changes, inducing an EMF and a current that opposes the change in flux (Lenz's Law).
What is the effect of increasing the velocity of a metal bar moving through a magnetic field on the induced EMF?
The induced EMF increases proportionally (ε = Blv).