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Unit 3.3
Question | Answer |
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Electric Current | The flow of electrons through a wire or other conductor. |
Direct Current | the flow of electrons directly along a path from the negative to the positive terminal. Can only flow in one direction. |
Alternating Current | an electric current where the flow of electrons rapidly reverses itself. |
Rectifier | converts alternating current (AC) into direct current (DC). |
Battery | a device that produces electrical energy from a chemical reaction involving two dissimilar metals, such as zinc and copper. |
Alessandro Volta | credited with inventing the first battery in 1800, and Napoleon made Volta a Count soon afterwards. |
Wet Cell Batteries | consists of two strips of dissimilar metals sitting in an acid bath. The two metal strips are commonly made of zinc and copper and sit in a solution of sulfuric acid. |
Electrodes | The dry ends of the metal strips in batteries |
Cathode | The electrode with the greatest number of electrons and forms the negative terminal of a battery. |
Anode | the electrode with less electrons |
Voltage | The difference in electrical pressure in a battery. |
Dry cell battery | the chemical reaction between metals and acid takes place in a paste rather than a liquid. |