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Carbon film resistors
a resistor that is made by coating nonconductive material with a film of carbon
Composition carbon resistor
resistors made by mixing carbon with other compounds to make a substrate with a known resistance
Fixed Resistor
resistor that has a value that cannot be changed
Metal Film Resistor
resistor made by coating a nonconductive material with a metal film
Metal Glase Resistor
resistor made by applying a mix of metal and glass to a nonconductive material
Multiturn variable resistor
variable resistor that requires multiple turns to change their resistance values
When is a multiturn variable resistor used
when precise control of measurement is needed
Potentiometer
variable resistor that has a sliding contact that is used as a voltage divider
Tolerance
amount of variation from a standard value that is permissible
Variable resistor
resistor whose resistance value can be varied between its minimum and its maximum values
Voltage divider
circuit that generally is constructed by connecting resistors in series to produce desired voltage drops across the resistors
Wire wound resistors
resistors that are constructed by winding resistive wire around a nonconductive material
Two purposes of resistors
limit current flow
voltage dividers
How is resistance related to area
they are inversely proportional (if area increases, resistance decreases)
How is resistance related to length
they are directly related (if length increases resistance increases)
List the types of fixed resistors
composition carbon \n metal film \n metal glaze \n carbon film \n wire wound
Disadvantage(s) of carbon composition resistors
they change value as they age or if they are overheated
Advantage(s) of metal film resistors over carbon composition
their value doesn’t change with age \n have better tolerance
What determines the resistance of a wire wound resistor
type of material used to make the wire \n diameter of the wire \n length of the wire
Why are carbon resistors widely used
they are inexpensive
How are metal glaze resistors made
combining metal with glass
When are wire wound resistors used
when a higher power rating is needed
Major advantage of wire wound resistors
they can operate at a higher temperature than other resistors
How should hollow wire wound resistors be mounted
vertically to allow air flow
What happens if the power rating of a resistor is exceeded
the resistor can be damaged
What unit is used to describe power ratings of resistors
Watts
What does the power rating of a resistor describe
the amount of heat that must be dissipated by the resistor