Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Magnetism & EM
Questions from PPT
| Question | Answer |
|---|---|
| What was the first magnet? | magnetite or lodestone |
| What is the largest magnet? | Earth |
| What is a battery? | source of electromagnetic force |
| What is magnetism? | fundamental property of some forms of matter |
| Describe magnetic field: | lines of force; indicate direction of magnetic force |
| Describe electron motion: | rotate on own axis; clockwise or counterclockwise |
| What is dipole? | each end has equal but opposite charges; North & South poles |
| What is domain? | accumulation of dipoles |
| Desribe lines of force: | inside magent: S-> N; outside magnet: N-> S |
| What is permeability? | ability to become magnetized |
| What is retentivity? | ability to remain magnetized |
| Describe 3 classifications of magnets: | natural-earth or lodestone; artificial-bar magnet; electromagnet-wire around iron core |
| Describe 4 states of matter: | nonmagnetic-unaffected; ferromagnetic-strongly attracted; paramagnetic-slightly attracted; diamagnetic-slightly repelled |
| List the Laws of Magnetism: | 1-dipole, North & South poles; 2-like poles repel, unlike poles attract; 3-ferromagnetic material can be magnetized in external magnetic field; 4-intensity of field is directly related to magnetic pole strength & indirectly related to distance squared |
| What is the unit of measure? SI? | gauss; tesla |
| What is electromagnetism? | force associated with electrons in motion |
| What are 3 ways of EM induction? | 1-move conductor across stationary magnetic field; 2-cut stationary conductor with magnetic lines of force; 3-stationary conductor in magnetic field with varying magnetic flux |
| What is Faraday's Law? | electric current is induced to flow in circuit if part of circuit is in changing magnetic field |
| What is Lenz's Law? | induced current flows opposite the action that induces it |
| What is a helix? | coil of wire |
| What is a solenoid? | coil of wire with a source and current |
| What is an electromagnet? | coil of wire with source & current that is wrapped around an iron core |
| Describe EM Self Induction: | coil of wire carries current & sets up current within itself |
| Describe Autotransformer: | primary side of circuit; kVp selector; uses self induction |
| Describe EM Mutual Induction: | primary coil-potential difference creates current; secondary coil-carries induced current |
| Describe Step Up Transformer: | uses mutual induction; voltage to kVp; amperage to mA; more turns on secondary coil |
| Describe Step Down Transformer: | uses mutual induction; kVp to voltage; mA to amperage; more turns on primary coil; filament current; secondary side of circuit |
| What is a generator? | dynamo; converts mechanical to electrical energy |
| What is a motor? | rotor; converts electrical to mechanical energy |
| Describe Air Core Transformer: | solenoid |
| Describe Open Core Transformer: | electromagnet |
| Describe Closed Core Transformer: | electromagnet where iron cores are connected |
| Describe Shell Core Transformer: | both coils of wire are wrapped around same iron core, iron core is laminated |
Created by:
gogators_721
Popular Physics sets