Karteikarten
Resistivity (Mod.3 Sect.2 Part 2) 2 of 2
Karten in diesem Stapel (37)
- 1The 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
- 2The 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
- 3The 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
- 4_____ is a measure of how much resistance a material has for a given length and cross-sectional area.Resistivity
- 5Resistivity is represented by the Greek letter __.row (looks like a p)
- 6The 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) - 7Most 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
- 8There 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
- 9Another effect of temperature on metals and other materials is _____ and _____.expansion, contraction
- 10Most materials ______ when their temperature increase.expand
- 11Most materials _____ when their temperature decreases.contract
- 12A measure of the amount of increase in volume with a n increase in temperature is called the _____________________.positive temperature coefficient of expansion
- 13If a material contracts when it's heated, it has a ___________.negative coefficient of expansion
- 14There 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)
- 15In the building construction industry, the maximum current allowed for each wire size is called its _____.ampacity
- 16When a material is _____ it is capable of being easily shaped.malleable
- 17Ampacity is the combination of two words: _____ and _____.ampere, capacity
- 18Three popular methods of tying cables together are ______, ________, and _____.spot tying, cable lacing, harnessing
- 19In the _______ process, a group or bundle of wires is secured together with individual ties. This method is often used when wiring panels.spot-tying
- 20In the ________ process, a group or bundle of wires is secured together with a continuous cord that forms loops at regular intervals.cable lacing
- 21Other 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
- 22A _____ is a group of wires bundled together to make a single unit.cable
- 23Some special types of cables are designed for use in high-frequency applications, _____ cables are an example.coaxial
- 24The two most popular types of cables are _____ and _____.50-ohm, 75-ohm
- 25The important thing to remember about coaxial cables is to never ____ their two types of hardware.mix
- 26_________ are special cables that are often used to carry power. (ex. power lines)Transmission lines
- 27Some important parts of a computer system are the pathways used to get information ____ and ____ of the computer,into, out
- 28The pathways in a computer system that are used to carry information in and out of the system are called _______.I/O sections
- 29A computer _____ is any external device that provides input and output for the computer.peripheral
- 30A keyboard and a mouse are examples of an _____ device.input
- 31A printer and a monitor are examples of an ____ device.output
- 32_________ - 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 conductorscoaxial cable
- 33_____ are colored threads that are visible when the insulation is removed from a wire.Tracers
- 34A _____ cable consists of several insulated wires connected together to form a flat ribbon.ribbon
- 35Some ribbon cables have terminations called _________. They're designed in such a way that unused pins can be purposely snapped off.breakaway pins
- 36A _______ is a device that splits a multi-wire line into several connectors. This makes troubleshooting easier.breakout box
- 37Two materials used to make fiber-optic light conductors are _____ and _____.glass, plastic
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