click below
click below
Normal Size Small Size show me how
Electromagnets
Question | Answer |
---|---|
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 |