Magnetism and Electromagnetism

Flashcards for Magnetism and Electromagnetism

Difference between Permanent and Electromagnets

Permanent magnets always have a fixed North and South pole, while electromagnets' poles can be reversed by changing the direction of the current.

Electromagnet Control

Electromagnets can be turned on/off and adjusted by changing the current.

Magnetic Field

The region around a magnet where magnetic forces are experienced.

Magnetic Field Lines

Lines that represent the magnetic field, running from North to South, never intersect, and their density indicates the field strength.

Electromagnetism

Electric current creates a magnetic field.

Vector towards you (•)

Symbol used to represent a vector pointing towards the observer.

Vector away from you (x)

Symbol used to represent a vector pointing away from the observer.

Lorentz Force

The force experienced by a current-carrying wire in a magnetic field, calculated as FL = B x I x l.

Turns Ratio/Voltage

Formula relating the ratio of voltages to the ratio of turns in a transformer: Us/Up = Ns/Np.