Resistivity (Mod.3 Sect.2 Part 2) 2 of 2

Questão	Responda
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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Resistivity (Mod.3 Sect.2 Part 2) 2 of 2

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	Criado por That Yeti Dog Person mais de 4 anos atrás