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Science Ch 19, 20 L1
Review for Science Chapter 19 and Chapter 20 Lesson 1 Quiz on 5/27/14
| Question | Answer |
|---|---|
| static charge | an unbalanced negative or positive electric charge on an object |
| electric insulator | a material through which electrons cannot easily move |
| electric conductor | a material through which electrons easily move |
| polarized | the condition of having electrons concentrated at one end of an object |
| electric discharge | the process of an unbalanced electric charge becoming balanced |
| electric current | rate at which charges pass through a given point |
| voltage | potential difference between 2 points in a circuit |
| resistance | opposition to the flow of electric charge |
| magnet | any object that attracts iron |
| magnetic poles | points on a magnet where the force is the strongest |
| forces | push or pull |
| auroras | formed when charged particles from the sun hit oxygen and nitrogen atoms in the air |
| static electricity properties | particles and electric charge, gaining and losing electrons, electric discharge, electric force, electric field, attraction, and repel |
| current electricity properties | moving electrons, conductors, resistance, current, and electric circuit |
| ac | alternating current |
| dc | direct current |
| temperature and resistance | + temp, more resistance |
| electrodes | conducting materials |
| electrolytes | mixture of chemicals |
| two kinds of cells | dry cells and wet cells |
| parts of a circuit | energy source, device that transforms energy, and conducting material |
| electrical devices are designed to | transform electric energy to kinetic energy |
| ex of energy source | battery |
| ex of device that transforms energy | light bulb |
| ex of conducting material | wires |
| series circuit | one path |
| parallel circuit | more then 1 path |
| Ohm's Law | when resistance increases, the voltage remains the same, there is less current |
| circuit breakers | open circuits when current becomes too high |
| fuse | metal that breaks a circuit |
| electric shock | when a current passes through a body |
| two magnetic poles | north and south |
| 3 magnetic materials | iron, cobalt, and nickel |
| when does attraction occur | opposite forces |
| when does repel occur | equal forces |
| groups of atoms i tiny areas align in | magnetic domains |
| cutting magnets in half creates | smaller magnets |
| kinds of magnets | ferromagnet, electromagnetic, temporary magnets, and permanent magnets |
| ferromagnet | made of iron, nickel, cobalt, or mixtures |
| electromagnet | made by an electric current |
| temporary magnets | made from materials that are easy to magnetize |
| permanent magnets | difficult to magnetize and tend to keep their properties longer |
Created by:
2018grellerj
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