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20.2 Chemistry
Vocabulary Words
Question | Answer |
---|---|
electric current | a continuous flow of electric charge |
direct current (DC) | a flow of electric charge in only one direction |
alternating current (AC) | a flow of electric charge that regularly reverses its direction |
electrical conductor | a material through which electric charge can flow easily |
electrical insulator | a material through which charge cannot flow easily |
resistance | the opposition to the flow of electric charges in a material |
superconductor | a material that has almost zero resistance when it is cooled to low temperatures |
potential difference | voltage, or the difference in electrical potential energy between two places in an electric field |
voltage | potential difference, the difference in electrical potential energy between two places in an electric field |
battery | a device that converts chemical energy into electrical energy |
Ohm's law | the relationship of voltage, current, and resistance: V=IR |