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Electrictity
Electrical Principles& Technologies- topics 1 & 2
Term | Definition |
---|---|
secondary cells | rechargeable cells |
batteries | made up of two or more cells |
electorchemistry | the study of chemical reactions involving electricity |
electrolysis | breakdown using electricity |
electroplating | coating a cheaper metal with the atoms of a more expensive metal, using an electrolyte |
electrolyte | liquid or paste used to conduct electricity |
electrode | conductor through which electric current enters or leaves a device or material |
ion | atom that has become electrically charged because it has lost or gained electrons |
superconductor | perfect conductor; substance with no resistance to electron flow |
resistor | device having resistance to electron flow; often used to control current in a circuit |
rheostat | continuously variable resistor used to regulate electric current; variable resistor |
Ohm's law | as long as temp. remains constant, the resistance of a conductor remains constant. And, current is directly proportional to voltage applied. |
series circuit | circuit-one pathway for the current, so the same current passes through all the components |
parallel circuit | circuit- the current can flow in two or more paths |
photoconductors | a resistor that becomes more conductive when exposed to light |
transistors | device(usually with 3 layers). Small VOLTAGE in middle layer controls CURRENT between outer layers-can act as a SWITCH or AMPLIFIER |
integrated circuits | circuits made of inseparable/microscopic components-(formed on a piece or chip of semiconductor crystal) |