Science - Chapter 21
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- increase voltage, increase number of times you wrap the wire around the iron core, have a bigger core
- How can we make an electromagnet stronger? (3 ways)
- magnetic domain
- group of atoms whose fields point in the same direction
- magnetic field
- surrounds a magnetic and exerts a magnetic force on other magnets
- generator
- devise that uses a magnetic field to turn kinetic energy into electrical energy
- run current through it
- How can we create a magnetic field around a wire?
- transformer
- devise used to increase or decrease the voltage of an alternating current
- aurora
- light display that occurs when charged particles trapped in the magnetosphere collide with Earth's atmosphere above the poles
- electromagnet
- magnet created by wrapping a current carrying wire aound an iron core
- magnetoshpere
- region of space affected by Earth's magnetic field
- it uses a magnetism and kinetic energy to produce energy
- What is the purpose of a generator?
- direct current flows in one direction and alternating current changes its direction repeatedly
- What is the difference between alternating current and direct current?
- alternating current
- electric current that changes its direction repeatedly
- the poles
- In a bar magnet, where are the lines of force the strongest?
- take a bar magnet and move it in and out through the wire
- How can we create current using only wire and a magnet?
- motor
- device that transforms electrical energy into kinetic energy
- it transform electrical energy into kinetic energy
- What is the purpose of an electric motor?