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Chapter 7
Physical Science Chapter 7
Question | Answer |
---|---|
Define Magnetism | The properties and interactions of magnets. Page: 202 |
Define Magnetic Field | A region of space that surrounds a magnet and exerts a force on other magnets and objects made of magnetic materials. Page: 203 |
Define Magnetic Poles | The regions of a magnet that exert the strongest force. Page: 204 |
Define Magnetic Domains | Groups of atoms with aligned magnetic poles. Page 207 |
Define Electromagnetic Force | The attractive or repulsive force between electric charges and magnets. Page: 210 |
Define Electromagnetism | The interaction between electric charges and magnets. Page: 210 |
Define Solenoid | A single wire wrapped into a cylindrical wire coil. Page: 210 |
Define Electromagnet | A temporary magnet created when there is a current in a wire coil. Page: 210 |
What is a Galvanometer? | A device that uses and electromagnet to measure electric current. Page: 213 |
What is an Electric Motor? | A device that changes electrical energy into mechanical energy. Page: 213 |
Define Electromagnetic Induction | The generation of an electric current by a changing magnetic field. Page 216 |
What Does a Generator Do? | It uses electromagnetic induction to transform mechanical energy into electrical energy. Page: 217 |
What is a Turbine? | A large wheel that rotates when pushed by water, wind, or steam. Page 218 |
Define Direct Current (DC) | An electric current that is always in one direction through a wire. Page: 220 |
Define Alternating Current (AC) | An electric current that reverses the direction in a regular pattern. Page: 220 |
What is a Transformer? | A transformer is a devise that increases or decreases the voltage of an alternating current. Page: 220 |