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Electromagnets

QuestionAnswer
How are electromagnets used to lift things? They are able to lift heavy items made out of steel or iron.
Where are lifting electromagnets used? Junkyards and car recycling
What is a magnetic field? The area around a magnet or electromagnet where you can detect the magnetic force.
How do we charge things using conduction? Metal objects touch other metal objects and the electric charge flows through the touching metal.
Where is conductive charging used? Anywhere you have a plug or cord that must be attached to connect to the electric charge.
What is inductive charging? Electric charges are passed through 2 objects that are near each other but not touching.
What are some examples of inductive charging? Cell phone that charge by sitting on a pad and don't need a cord, electric toothbrushes that have no metal contacts between the base and the toothbrush.
What is a step-up transformer? A transformer increases voltage and decreases current
What is a step-down transformer? A transformer decreases voltage and increases current.
What is a solenoid? A coil of wire that makes a magnetic field when it carries an electric current.
How can you make a coil of wire produce electricity? Move a magnet in and out of the coil.
What is an electromagnet? A coil of wire with a metal core that becomes magnetic when a current goes through the wire.
What is an AC current? A current that alternates, it goes one direction and then switches and goes the other direction.
Where do you see AC current? Wall plugs in buildings
What is a DC current? A current that only goes one direction.
Where do you see DC current? batteries
Where is magnetic current the strongest? Near the ends of bar magnets
What uses a coil of wire, a magnet, and movement to create electricity? generator
What uses a coil of wire, a magnet, and electricity to create movement? motor
Created by: MsLW