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.