Podcast
Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App
Questions and Answers
Quin mineral va ser descobert a Magnèsia, Grècia, i ara es coneix com a magnetita (Fe3O4)?
Quin mineral va ser descobert a Magnèsia, Grècia, i ara es coneix com a magnetita (Fe3O4)?
- Cobalt
- Ferro
- Níquel
- Magnet (correct)
Quins metalls poden convertir-se en imants artificials?
Quins metalls poden convertir-se en imants artificials?
- Zinc i estany
- Plata i alumini
- Or i coure
- Ferro, cobalt i níquel (correct)
Quants pols té un imant?
Quants pols té un imant?
- Un
- Tres
- Dos (correct)
- Quatre
Què és la declinació magnètica?
Què és la declinació magnètica?
Signup and view all the answers
Quines són les magnituds principals de la corrent elèctrica?
Quines són les magnituds principals de la corrent elèctrica?
Signup and view all the answers
Què s'utilitza per mesurar les magnituds elèctriques en un circuit?
Què s'utilitza per mesurar les magnituds elèctriques en un circuit?
Signup and view all the answers
Què estudia l'electromagnetisme?
Què estudia l'electromagnetisme?
Signup and view all the answers
Què és la inducció electromagnètica?
Què és la inducció electromagnètica?
Signup and view all the answers
Què fan els motors?
Què fan els motors?
Signup and view all the answers
Flashcards are hidden until you start studying
Study Notes
- Magnetism was first discovered in Magnesia, Greece.
- The mineral that was discovered is now known as magnetite (Fe3O4).
- There are natural magnets in addition to magnetite.
- Iron, cobalt, and nickel can become artificial magnets.
- A magnet has two poles, north and south.
- The Earth acts as a magnet with magnetic poles near but not identical to the geographic poles.
- The angle between the magnetic and geographic north is called magnetic declination.
- Electricity is a form of energy based on the attraction and repulsion of electrons.
- The main magnitudes of electric current are voltage, resistance, current intensity, and power.
- Multimeters are used to measure these magnitudes in a circuit.
- Electromagnetism studies the interactions between magnetic fields, electric charges, and currents.
- Electromagnetism is responsible for almost all physical phenomena in daily life.
- Induction electromagnetism is the process by which varying magnetic fields create electric fields and currents.
- Motors convert electrical energy into mechanical energy using magnetic fields.
- Transformers are machines that convert electrical energy from one set of characteristics to another using induction electromagnetism.
- Transformers have three main parts: a ferromagnetic core, a primary coil, and one or more secondary coils.
- Transformers can increase or decrease voltage in an AC circuit without changing power.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
