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Electricity 4-6
Question | Answer |
---|---|
Thermal energy | energy from heat. Also the most commonly "lost" type energy in conversions |
chemical energy | energy from chemical reactions |
electrical energy | energy from moving electrons |
mechanical energy | energy from movement |
light energy | energy that you can see |
filament | the resistant coil of wire in a lightbulb that turns electrical energy to thermal and light energy |
Thermocouples | convert heat into electrical energy |
photovoltaic cells | another name for solar panels |
piezoelectric effect | pressure (mechanical energy) turning into electrical energy. ex. musical greeting cards |
electrochemical cells | placing metallic electrodes into an electrolyte where a chemical reaction either uses or generates an electric current. A very basic battery. |
Giovani Galvani | Scientist who believed in "animal electricity" |
Alessandro Volta | Scientist who created the "Volta Pile" which was the first battery |
Electrodes | Metal portion of an electrochemical cell |
anode | negative electrode |
cathode | positive electrode |
electrolyte | liquid portion of an electrochemical cell. Must be acidic or salty |
wet cell | When the electrolyte is a liquid |
dry cell | when the electrolyte is paste or flaky |
primary cells | single use batteries |
secondary cells | rechargeable batteries |
Generators | device that turns mechanical energy into electrical energy |
motors | device that turns electrical energy into mechanical energy |
Electromagnets | Using the link between electricity and magnetism to create electricity from magnets or vice versa |
Alternating Current | e- flow in one direction, then change. About 50-60 times a second . Used in powerlines |
Direct Current | current that only flows in one direction. Used in batteries |
split ring communtator | device used in DC electricity to ensure it only flows one way |
Armature | device in a motor that functions like an electromagnet |