Resistors Short Questions And Answers

Define resistance.

Restricting or reducing the flow of electric current to certain level is called resistance.

 Define resistor.
Resistor is an electronic component that restricts or reduces the flow of electric current to certain level.

 What is the ohm's law equation for resistance?
The amount of electric current reduced by the resistor is determined by using the ohm's law equation.
The amount of electric current reduced by the resistor is determined by using the ohm's law equation.
Where R = Resistance
V = Voltage
I = Electric current
The electric current flowing through the resistor increases with increasing the voltage (if resistance is held constant) and decreases with increasing the resistance of a resistor (if applied voltage is held constant).

What is the basic unit used to measure the resistance of a resistor?
Ohm is the basic unit used to measure the resistance of a resistor.

What are the advantages of resistors?
Resistors are very small in size.
It is very easy to carry resistors from one place to another place.
Resistors are very cheap.

List different types of resistors
Resistors are mainly classified into two types:
Fixed resistors
Variable resistors

Define fixed resistor.
Fixed resistor is a type of resistor which provides fixed resistance to the electric current.

Define variable resistor.
Variable resistor is a type of resistor which controls (increases or decreases) the flow of electric current by changing its resistance.

List different types of fixed resistors
The different types of fixed resistors include:
Carbon film resistor
Carbon composition resistor
Metal film resistor
Metal oxide film resistor
Wire wound resistor
Thick film resistor
Thin film resistor
Metal glaze resistor
Foil resistor

List different types of variable resistors
The different types of variable resistors include:
Rheostat
Potentiometer
Trimmer

List various applications of variable resistors
The various applications of variable resistors are:
Oscillators
Audio control
TV receivers
Transducers

Define wire wound resistor.
Wire wound resistor is a type of resistor in which metal wires are used to reduce the flow of electric current

List different types of wire wound resistors
The wire wound resistors are mainly classified into two types:
Precision wire wound resistors
Power wire wound resistors

List various applications of wire wound resistors
The various applications of wire wound resistors are:
Current sensing
Telecommunication
Computers
Medical electronic equipments
Audio and video equipments
Current and voltage balancing
Telephone switching systems
Transducers instrumentation
Defense and space

What are the advantages of wire wound resistors?
High accuracy
High stability
Low cost

Define carbon composition resistor.
Carbon composition resistor is a type of fixed resistor which reduces the flow of electric current by using its resistive element.

What are the disadvantages of carbon composition resistors?
Generate high noise
Low accuracy
Poor stability

List various applications of carbon composition resistors
The various applications of carbon composition resistors are:
Welding controls
Current limiting
High voltage power supplies
Protection of circuits

Define carbon film resistor.
Carbon film resistor is a type of fixed resistor which uses carbon film as the resistive element to restrict electric current.

What are the advantages of carbon film resistor?
Low cost
Wide operating range
Generates low noise
Low tolerance

What are the various applications of carbon film resistor?
The various applications of carbon film resistors are:
Power supplies X-rays RADAR

Define metal film resistor.
Metal film resistor is a type of fixed resistor which uses metal film as the resistive element to restrict electric current.

What are the advantages of metal film resistors?
Very small in size
Low cost
Low tolerance
Wide operating range
Generates less noise
Long-term stability
Low temperature co-efficient of resistance

Define metal oxide film resistor.
Metal oxide film resistor is a type of fixed resistor which uses metal oxide film as the resistive element to restrict electric current.

What are the advantages of metal oxide film resistors?
High reliability
Generate low noise
Low cost
High stability
Small size

Define potentiometer.
Potentiometer is a type of variable resistor in which the resistance is manually varied to control the flow of electric current.

List various applications of potentiometers
The various applications of potentiometers are
Television
Computer
Frequency attenuation
Changing loudness
Audio equipments

Define rheostat.
Rheostat is a type of variable resistor which is used to control the flow of electric current by manually increasing or decreasing its resistance.

List various applications of rheostat
Rheostats are used to increase or decrease the volume of a radio.
Rheostats are used in dim lights to change the intensity of light.
Rheostats are used to increase or decrease the speed of an electric motor.

Define thermistor.
Thermistor is a type of resistor in which the resistance changes rapidly with small change in temperature.

List different type of thermistors
Thermistors are classified into two types
Negative Temperature Co-efficient (NTC) thermistors
Positive Temperature Co-efficient (PTC) thermistors

What are the advantages of thermistors? Low cost Small size
It is easy to carry from one place to another place.

What are the disadvantages of thermistors?
Not suitable for wide operating range Resistance vs temperature characteristics is highly non-linear

List various applications of thermistors
Medical equipments
Inrush current limiter
Temperature sensors
3d printers
Computers

Define magneto resistor.
Magneto resistor is a type of resistor in which the resistance changes when an external magnetic field is applied.

List various applications of magneto resistors
Hard disk drives
Bio-sensors
Measuring electric current
Magnetic field sensors

Define photoresistor.
Photoresistor is a type of resistor in which the resistance decreases when the intensity of applied light increases.

Define humistor.
Humistor is a type of resistor in which the resistance changes when humidity of surrounding air changes.

Force sensitive resistor.
Force sensitive resistor is a type of resistor in which the resistance decreases when the applied force increases.

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