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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 |