DC Chapter 7

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How many leads does a potentiometer have?

3

Resistors can have how many bands of colors

3 to 5

Name two types of variable resistors.

Potentiometer and Rheostat

Resistance of the Wire (symbol)

R

What is the formula for temperature change?

R change/Old R x Coef

What is the formula for resistance change?

Resistance x Coef x Temp Change

What are one of the most common components found in electric circuits

Resistors

What limits the flow to current through a cicuit

Resistors

What are made by winding a piece of resistive wire around a ceramic core?

Wire wound resistors

How many leads does a rheostat have?

2

Cross sectional area in CM (symbol)

A

American Wire Gauge (AWG) is also known as?

Brown & Sharpe Gauge (B&S)

One of the most common types of fixed resistors is the?

Carbon Resistor

A _____________ is a unit of measurement describing the cross-sectional area of a conductor.

Circular Mil

The values of a resistor can often be determined by the?

Color Code

A rope-stranded cable consists of several __________ cables twisted together

Concentric

A conductor with a smaller diameter has less resistance than a conductor with a larger diameter.

False

A potentiometer varies the amp

False

Resistance is higher on a cold wire than a hot wire

False

What have only one ohmic value that cannot be changed or adjusted?

Fixed Resistors

Resistivity of the material (ohms per mil-foot)(symbol)

K

Length in Feet (symbol)

L

A hot lamp draws ______ current than a cold lamp

Less

A ________ is a unit for measuring the diameter of a wire, equal to one thousandth of an inch (0.0254 millimeters).

Mil

_____________ is a conductor with a 1 mil (0.001 inches) diameter and a length of one foot, used as a standard for defining resistivity of a given material.

Mil-Foot

What is the name of the special resistance wire used in heating appliances?

Nichrome

The first two color bands on a resistor represent what?

Numerical Values

Resistors are rated by __________ and __________.

Ohms and watts

List the four factors that can determine the amount of resistance, what are they?

Temperature, Material, Gauge, Length

The third color band on a resistor is called what?

The Multiplier

The fourth band on a resistor represents the what?

The Tolerance

A rheostat varies the amperage.

True

A standard wire has the same amount of copper and the same current-carrying capacity as a solid wire of the same size.

True

A _______________________ is a resistor whose values can be changed or varied over a range

Variable resistor

The second principal function of resistors is to produce a?

Voltage Divider

Not only is the resistance greater as the temperature rises, but it is also increasing at a _____________ rate as the temperature rises

faster

Carbon resistors are very popular for most applications because they are ___________ and ______________

inexpensive, readily available

Material that tend to prevent current from flowing through them

nonconductors or insulators

As a lamp turns _____, the resistance of the filament increases sharply

on

As the temperature approaches absolute 0 many metals and alloys lose all their electrical resistance. This behavior is called what?

superconductivity


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