Magnetism
Magnetism: The force of attraction or repulsion between unlike or like poles.
-Due to the arrangement of electrons.
-Closely related to electricity.
Magnetic Poles:
-Like poles repel.
-Unlike poles Attract.
-A broken magnet creates new poles.
Magnetic Field:
-Area around a magnet where magnetic forces act.
-Field lines show direction of field (N ---> S)
Magnetic Domain:
-A cluster of billions of atoms with magnetic fields aligned.
-When domains are randomly arranged- Forces cancel each other out. ( No magnetic Effect)
-When domains have their magnetic affect aligned- Forces are additive and create a strong magnetic effect.
Electromagnet:
-Strong, temporary magnet formed when current is passed through a coil of wire surrounding an iron core.
-Acts like a bar magnet when current is on.
-Converts electrical energy to mechanical energy.
Magnetism: The force of attraction or repulsion between unlike or like poles.
-Due to the arrangement of electrons.
-Closely related to electricity.
Magnetic Poles:
-Like poles repel.
-Unlike poles Attract.
-A broken magnet creates new poles.
Magnetic Field:
-Area around a magnet where magnetic forces act.
-Field lines show direction of field (N ---> S)
Magnetic Domain:
-A cluster of billions of atoms with magnetic fields aligned.
-When domains are randomly arranged- Forces cancel each other out. ( No magnetic Effect)
-When domains have their magnetic affect aligned- Forces are additive and create a strong magnetic effect.
Electromagnet:
-Strong, temporary magnet formed when current is passed through a coil of wire surrounding an iron core.
-Acts like a bar magnet when current is on.
-Converts electrical energy to mechanical energy.
Speaker: Wire coil moves back and forth as its magnetic field interacts with the field of a fixed magnet.
-Forced vibration causes the cone to move = sound.
Motor: Electromagnet rotates between the poles of a fixed magnet.
Electromagnet Induction: Producing a current by moving a wire through a magnetic field.
-Mechanical energy ---> electrical energy.
-Electric Generator:
-Armature is rotated between magnetic poles.
-Magnetic field induces a current in the wire coil.
-Alternating Current:
-Current reverses direction at regular intervals.
-Electrical outlets for example.
-Direct Current:
-Current flows in one direction.
Transformer:
-Increases or decreases AC voltage.
-Primary coil AC produces a magnetic field that induces AC in the secondary coil.
-Voltage Ratio- Ratio of turns in each coil.
-Forced vibration causes the cone to move = sound.
Motor: Electromagnet rotates between the poles of a fixed magnet.
Electromagnet Induction: Producing a current by moving a wire through a magnetic field.
-Mechanical energy ---> electrical energy.
-Electric Generator:
-Armature is rotated between magnetic poles.
-Magnetic field induces a current in the wire coil.
-Alternating Current:
-Current reverses direction at regular intervals.
-Electrical outlets for example.
-Direct Current:
-Current flows in one direction.
Transformer:
-Increases or decreases AC voltage.
-Primary coil AC produces a magnetic field that induces AC in the secondary coil.
-Voltage Ratio- Ratio of turns in each coil.
Questions:
1. What is magnetism? (see student solutions)
2. What happens is magnetic domain when domain are randomally arranged? (see student solutions)
3. How does an electric generator work?
4. Explain magnetic poles.
1. What is magnetism? (see student solutions)
2. What happens is magnetic domain when domain are randomally arranged? (see student solutions)
3. How does an electric generator work?
4. Explain magnetic poles.
The light bulb moment is obvious. Magnets literally make up the world. We use them to get energy, we use them to hold things to our fridges, and so much more.