Jesse Flashcards
A retort stand holds an aluminium strip, connected in series to a power source. A magnet is brought close to the aluminium.
What does this experiment demonstrate?
The Motor Effect
(I.e. a deflection of the aluminium strip based upon the orientation of the magnet, and the direction of current)
Describe the ‘motor effect’ in relation to electromagnetism.
The experience of a force in a current carrying conductor that occurs in a magnetic field.
What do each of the arrows correspond to in the following gesture?
Thumb: Direction of current
Fingers: Direction of magnetic field (North -> South)
Palm: Direction of force
What factors affect the size of the force acting on a current carrying conductor?
Size of the current in the conductor.
The strength of the magnetic field.
The angle the conductor makes to the magnetic field.
The length of the conductor in the magnetic field.
What would happen to the force exhibited by a conductor, if the current passed through it is doubled?
The force experienced is also doubled.
The number of flux lines through a unit area, perpendicular to a magnetic field.
What does this definition describe?
Magnetic Flux Density
(The more lines in the same area means a higher magnetic flux density)
What is the relationship between magnetic flux density and magnetic field strength?
Magnetic flux density is proportional to magnetic field strength.
What is Magnetic Flux?
The amount of magnetic field (magnetic flux density) passing through a surface.
What is the unit for Magnetic Flux?
The Weber (Wb)
What is the worded form of Faraday’s Law?
When a magnetic flux occurs in a conductor, an elecromagnetic force (voltage) is induced, that is proportional to the change of magnetic flux.
What is the Generator Effect?
(Also known as Electromagnetic Induction)
An electromagnetic force (voltage) experienced in a conductor that is within a changing magnetic flux.
What are the essential components of an AC motor?
