intro to electricity
Terms
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- Law of electric charges
- like charges repel and opposite charges attract
- electric force
- force between charged objects depends on size of charge and distance between charges
- electric field
- a region around a charged particle that can exert a force on another charged particle
- friction
- rubbing two objects together can cause electrons to be wiped from one object and transferred to another
- conduction
- electrons are transferred from one object to another by direct contact
- Induction
- charges in an uncharged object are rearranged without direct contact with a charged object
- conservation of charge
- no charges can be created or destroyed
- detecting charge
- use an electroscope
- electroscope
- a metal ball attached to a metal rod with two metal leaves hanging.
- conductors
- a material in which charges can move easily
- insulators
- a material in which charges can not move easily
- Examples of conductors
-
copper, silver, aluminum, mercury
(metals) - examples of insulators
- plastic, rubber, wood, glass
- static electricity
- the buildup of charges on an object
- electric discharge
- loss of static electricity as charges move off an object
- lightning rods
- pointed rod attached to ground by wire, placed at tallest point on a building
- grounded
- in contact with the earth
- electric current
- a flow of charges
- cell
- a devise that produces an electric current by converting chemical energy into electrical energy
- battery
- device composed of several cells
- electrolyte
- part of a cell, mixture of chemicals that converts chemical energy into electrical energy
- electrodes
- part of a cell, two different conducting materials in contact with the electrolyte
- wet cell
- liquid electrolyte
- dry cell
- solid or pastelike electrolyte
- photocell
- part of a solar panel that converts light into electrical energy
- thermocouples
- device that converts thermal energy into electrical energy