30743697
Description
Flashcards by That Yeti Dog Person, updated more than 1 year ago
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Created by That Yeti Dog Person
over 3 years ago
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| Question | Answer |
| The resistance of a wire depends on the following: the ____ of the wire, the _______ of the wire, the ____ of the wire's material, and the wire's _____. | length, cross-sectional area, resistivity, temperature |
| The length of a wire affects the resistance of the wire. This is a ____ relationship: if you double the length of a wire, its resistance will also be doubled. | direct |
| The cross-sectional area of a wire affects the resistance of a wire. This is an _____ relationship: if you increase the cross-sectional area of a wire, its resistance will decrease and vise versa. | inverse |
| _____ is a measure of how much resistance a material has for a given length and cross-sectional area. | Resistivity |
| Resistivity is represented by the Greek letter __. | row (looks like a p) |
| The equation that shows how the length, cross-sectional area, and resistivity are related to the resistance of a wire is: ______. | R = p x L/A (p is row) |
| Most pure metals undergo an increase in resistance with an increase in temp. When a metal, such as copper, does this, it's said to have a ________________. | positive temperature coefficient of resistance |
| There are some materials that undergo a decrease in resistance when there's an increase in temperature. Those materials are said to have a _______________. | negative temperature coefficient of resistance |
| Another effect of temperature on metals and other materials is _____ and _____. | expansion, contraction |
| Most materials ______ when their temperature increase. | expand |
| Most materials _____ when their temperature decreases. | contract |
| A measure of the amount of increase in volume with a n increase in temperature is called the _____________________. | positive temperature coefficient of expansion |
| If a material contracts when it's heated, it has a ___________. | negative coefficient of expansion |
| There are two important characteristics of copper wire that aluminum wire can't match: copper wire is a good conductor of ____, and copper used for wire is a _____ material. | heat, malleable (flexible) |
| In the building construction industry, the maximum current allowed for each wire size is called its _____. | ampacity |
| When a material is _____ it is capable of being easily shaped. | malleable |
| Ampacity is the combination of two words: _____ and _____. | ampere, capacity |
| Three popular methods of tying cables together are ______, ________, and _____. | spot tying, cable lacing, harnessing |
| In the _______ process, a group or bundle of wires is secured together with individual ties. This method is often used when wiring panels. | spot-tying |
| In the ________ process, a group or bundle of wires is secured together with a continuous cord that forms loops at regular intervals. | cable lacing |
| Other wire grouping methods include plastic ties and clips that are used to hold wires together and also hold them to a panel. Prefabricated wire groups called _____ are also available from some manufacturers. | harnesses |
| A _____ is a group of wires bundled together to make a single unit. | cable |
| Some special types of cables are designed for use in high-frequency applications, _____ cables are an example. | coaxial |
| The two most popular types of cables are _____ and _____. | 50-ohm, 75-ohm |
| The important thing to remember about coaxial cables is to never ____ their two types of hardware. | mix |
| _________ are special cables that are often used to carry power. (ex. power lines) | Transmission lines |
| Some important parts of a computer system are the pathways used to get information ____ and ____ of the computer, | into, out |
| The pathways in a computer system that are used to carry information in and out of the system are called _______. | I/O sections |
| A computer _____ is any external device that provides input and output for the computer. | peripheral |
| A keyboard and a mouse are examples of an _____ device. | input |
| A printer and a monitor are examples of an ____ device. | output |
| _________ - has 2 conductors; The outer conductor is a shield made with braided wires. The inner conductor is a solid-copper wire.; some versions have 2 inner conductors | coaxial cable |
| _____ are colored threads that are visible when the insulation is removed from a wire. | Tracers |
| A _____ cable consists of several insulated wires connected together to form a flat ribbon. | ribbon |
| Some ribbon cables have terminations called _________. They're designed in such a way that unused pins can be purposely snapped off. | breakaway pins |
| A _______ is a device that splits a multi-wire line into several connectors. This makes troubleshooting easier. | breakout box |
| Two materials used to make fiber-optic light conductors are _____ and _____. | glass, plastic |
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