electronics summative test 1 q3

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resistor

An electrical device that resists the flow of electrical current through the circuit. it comes in various sizes, types, and ratings to accommodate the needs of almost any circuit application.

the type of material used in making a resistive wire. the diamater of the wire (thickness). the length of the wire

factors that determine the resistance of the wire wound resistor

potential divider

a series circuit with two resistor and a power supply

it is less expensive than metal film resistors. it has a higher tolerance than carbon composition resistors. high voltage and high temperature applications. operating voltage up to 15kV with a nominal temperature of 350 degrees celsius.

advantages of carbon film resistors

have good characteristics for tolerance, stability, and TCR. also features low noise properties and high linearity because of low voltage coefficient.

advantages of metal film resistors

can operate at higher temperature than any other type of resistor, can be produced very accurately. has excellent properties for low resistance values and high power rating.

advantages of wire-wound resistor

x-rays, radar, layers, high voltage power supplies

applications of carbon film resistors

protection of circuits (surge/discharge protection), high voltage power supplies, current limiting, high power/strobe lighting, welding

applications of carbon-composition resistor

active filters, bridge circuit

applications of metal film resistors

circuit breakers and fuses

applications of wire wound resistors

by connecting resistors of the proper value.

by ____________________________, almost any voltage desired can be obtained.

carbon graphite and resin bonding material

composition of a carbon-composition resistor and it also determines the value of its resistance.

metal film resistor, carbon-composition resistor, carbon film resistor, wire wound resistor

different types of fixed resistors

it is expensive. requires a lot of space for mounting. it exhibits inductance in circuits that operate at high frequencies and it can cause problems to the rest of the circuit.

disadvantages of the wire wound resistor

rheostat and potentiometer

examples of variable resistors

E12 series

has 12 values and it is the most commonly used E-series for resistors. has a tolerance of +-10%, it is sufficiently accurate for almost all projects and it is sensible because most resistors have a tolerance of +- 10%

E24 series

has 24 values, more accurate with more chance of it being closer to its actual value.

tolerance

indicates the plus and minus limits of a resistor's ohmic value

variable resistor

it can be adjusted from its minimum to maximum value by turning its control.

variable resistor

it can be obtained in different case styles and power ratings

fixed resistor

it consists of only one ohmic value, which cannot be changed.

carbon film resistor

it is made out of a film of carbon (a resistive element) coating the ceramic rod (non-conducting body) in a vacuum.

metal film resistor

it is made out of a film of metal (a resistive element) coating the ceramic rod (non-conducting body) in a vacuum.

wire wound resistor

made by winding a piece of resistive (insullated metallic wire) wire around a ceramic core.

carbon-composition resistor

most commonly used type of fixed resistor that is cheap and readily available. It can withstand high energy pulses while having a relatively small size. one of its components is clay.

because it is cheap, readily available and it can withstand a high power rating despite its relatively small size

reasons why carbon-composition resistors are popular.

it is expensive

the disadvantage of metal film resistors

power rating

the maximum amount of energy it can dissipate without failing or degrading.

resistance

the opposition to the flow of electrons in an electrical circuit.

final answer is less than or equal to the given power rating

the resistor is suitable to the power rating

final answer is greater than or equal to the given power rating

the resistor is unsuitable to the power rating

bands

the stripes of the resistor color-code

variable resistor

the values can be changed over a range.

nichrome, constantan, manganin

the wire of the wire wound resistor is usually made of an alloy such as ___________________

1 ohm - 22 mega ohms

they are made in standard values that range from _________________

preferred values or E-series

to save manufacturing costs and prevent having too many resistor values available, only certain values are made

fixed resistor and variable resistor

types of resistors

the type of metal used and the thickness of the film

used to determine the resistance of a metal film resistor

resistor color-code

uses colored bands to quickly identify a resistors resistive value and its percentage of tolerance with the physical size of the resistor indicating its wattage rating.

because it determines the amount of current that will flow in an electrical circuit.

why is resistance important?

the metal film resistor does not change its value with age and its tolerance is generally better than the carbon resistors

why is the metal film resistor superior to carbon resistors?


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