2931883
Description
Flashcards by Lillian Mehler, updated more than 1 year ago
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Created by Lillian Mehler
over 10 years ago
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| Question | Answer |
| Electricity- | source of energy produced by flow or storage of electrons (sub- atomic particles with negative charge) |
| Electronic Device | process electricity for various functions (amplify electrical signal, perform calculations, store binary info) |
| Atoms | (what all matter is composed of)- composed of protons (+), neutrons (no charge), electrons (-). |
| protons and neutrons- | tightly bond at the core (atom nucleus) |
| electrons- | orbit around the core |
| Force (F) between electrical charges | Directly proportional to charge Inversely proportional to the distance between charges |
| Element- | an atom that cannot be subdivided into smaller substances |
| Atomic number= | number of Protons |
| Compounds- | when two or more elements combine to form a new substance. |
| Molecule- | smallest form of a compound, exhibits properties of the substance |
| Conductors | allow current flow): Silver (best), Copper (2nd best) |
| Insulators (poor conductors): | Glass, Porcelain, Teflon |
| Voltage: | establishes electrical current; amount of energy available to move electrons from one point to another in a circuit; measured in Volts (V); i.e. batteries, solar cells, generators; (negative to positive when applied to conductive or semiconductive material & random motion of free electrons) |
| Current (I): | time rate of electron (charge) flow; measured in ampere (A). |
| Resistance: | opposition to current; materials tend to resist flow of electricity through them (resistance); measured in ohms |
| Digital Multimeter (DMM)- | measures voltage, current, and resistance |
| Joule- | work done when a force of one newton is applied through one meter |
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