agra,ahmedabad,ajmer,akola,aligarh,ambala,amravati,amritsar,aurangabad,ayodhya,bangalore,bareilly,bathinda,bhagalpur,bhilai,bhiwani,bhopal,bhubaneswar,bikaner,bilaspur,bokaro,chandigarh,chennai,coimbatore,cuttack,dehradun,delhi ncr,dhanbad,dibrugarh,durgapur,faridabad,ferozpur,gandhinagar,gaya,ghaziabad,goa,gorakhpur,greater noida,gurugram,guwahati,gwalior,haldwani,haridwar,hisar,hyderabad,indore,jabalpur,jaipur,jalandhar,jammu,jamshedpur,jhansi,jodhpur,jorhat,kaithal,kanpur,karimnagar,karnal,kashipur,khammam,kharagpur,kochi,kolhapur,kolkata,kota,kottayam,kozhikode,kurnool,kurukshetra,latur,lucknow,ludhiana,madurai,mangaluru,mathura,meerut,moradabad,mumbai,muzaffarpur,mysore,nagpur,nanded,narnaul,nashik,nellore,noida,palwal,panchkula,panipat,pathankot,patiala,patna,prayagraj,puducherry,pune,raipur,rajahmundry,ranchi,rewa,rewari,rohtak,rudrapur,saharanpur,salem,secunderabad,silchar,siliguri,sirsa,solapur,sri-ganganagar,srinagar,surat,thrissur,tinsukia,tiruchirapalli,tirupati,trivandrum,udaipur,udhampur,ujjain,vadodara,vapi,varanasi,vellore,vijayawada,visakhapatnam,warangal,yamuna-nagar
Uses of Transistors

Uses of Transistors

Transistors are semiconductor devices that are used in modern electronic equipment to switch or amplify electronic signals. They are also used for the same purpose in electrical power machinery. Transistors are widely accepted to be the basic building blocks of modern electronics machinery. They are manufactured from semiconductor materials.

Semiconductor definition: Semiconductors are naturally occurring materials that exhibit the behaviour of both conductors and insulators. However, they are neither good conductors nor good insulators. This property of semiconductors can be exploited by means of doping to achieve controlled current flow that is very important for the functioning of a transistor.

A transistor has three terminals that connect it to any external circuit. The voltage and current at any two terminals can be used to control the voltage and current at the other two terminals. Today, transistors are packaged individually. But many more transistors are found embedded in IC (integrated circuits).

Importance of transistors

Transistors are important components of almost all modern electronic devices. From supercomputers used in advanced labs to the smartphone seen in everybody’s hands, transistors are used in all the major electronics devices we see around us. As a result, transistors are considered by many to be one of the most important inventions of the 20th century.

MOSFET transistors, also called MOS transistors, are the most widely used transistors. They are used more than any other transistor in existence currently. The first MOS transistor was invented at Bell laboratories in 1959. The inventors were Mohamed Atalla and Dawon Kahng. Bell Labs is a very prominent research institution in the US.

With the invention of the MOS transistors, we entered the digital age. MOS transistors are used extensively in digital electronics. The processors we use in our personal computers have MOS transistors as a very important component. Today, MOS transistors are mass-produced using a highly automated process.


When a small signal is applied between one pair of terminals in a transistor, this signal can be manipulated to control a much larger signal at the other pair of terminals. This property of a transistor is called gain because the signal is acquiring strength in the process of switching or amplification. A strong output is therefore produced at the other pair of terminals. This output can be voltage, current or an electronic signal. The output is always proportional to the input signal. Due to this property, the transistor can act as an amplifier.

Transistors can also be used to turn current on and off in a circuit. The use of the transistor makes the circuit electrically controllable. The amount of current that flows through the transistor is determined by other circuit elements.

Bipolar transistors have base, emitter and collectors as the three terminals. A small current between base and emitter controls and switches a much larger current between the collector and emitter.

Transistor as a switch

Transistor switches exist in either on or off state. Transistor switches are used in both high powered appliances and low powered appliances. One example of use in a low powered appliance is the use of switch transistors in logic gates. Logic gates are the building blocks of the processors used in the computers that we use.

Important parameters of a switch transistor are the magnitude of current switched, the voltage handled, and the speed at which the switching takes place. This is described by the phenomenon of rise and fall times.

Grounded emitter transistor circuits are most commonly used as switches in circuits. If the base current rises even slightly in such transistors, the emitter and the collector current show a dramatic increase. The collector voltage drops because of reduced resistance between the collector and the emitter. If the voltage difference between the collector and the emitter is zero, the collector current only depends upon load resistance and the supply voltage. This condition is called saturation, and the transistor is said to be in an on state.

Transistor as an amplifier

An emitter amplifier transistor is designed in such a way that a small change in voltage changes the small current that is transitioning through the base of the transistor. The current amplification at the base configures the transistor in such a way, combined with the properties of the circuit that a small change in the input voltage produces a proportionately large change in the output voltage.

Various configurations are possible for the amplifying transistor. In some configurations, voltage gain is achieved, in other configurations, the current gain is achieved. The amplifying transistors are used in a variety of devices-- from mobile phones to televisions. They amplify and reproduce sound, are used in radio transmission and also help in signal processing.

Aakashians JEE Topper

Aakashians NEET UG 2023 Champions Again

Historic Results 2023 Aakashians Qualified +1 Lakh

JEE Advanced 2023

JEE Advanced 2023 Stats

JEE Advanced 2022 Topper

NEET Related Links

NEET Exam 2024

NEET 2024 Exam Dates

NEET 2024 Exam pattern

NEET 2024 Syllabus

NEET 2024 Eligibility Criteria

NEET 2024 Application

NEET UG Counselling


NEET UG Result

NEET 2024 Cut Off

Neet 2023 Toppers List Names & Rank

Neet Result 2023 Toppers list rank cut off

Neet Answer key Live Download PDF

Neet 2023 State Toppers List

JEE MAIN Related Links

JEE Main 2024

JEE Main Rank Predictor 2024

JEE Main College Predictor 2024

JEE Main 2024 Exam Dates

JEE Main 2024 Exam pattern

JEE Main 2024 Application

JEE Main 2024 Eligibility Criteria

JEE Main 2024 Syllabus

JEE Main 2024 Physics Syllabus

JEE Main 2024 Maths Syllabus

JEE Main 2024 Chemistry Syllabus

JEE Main 2024 Admit Card

JEE Main 2024 Counselling

JEE Main marks vs rank vs percentile

JEE Advanced Result 2023 live topper list

JEE Exam Preparation - How to calculate your rank jee

JEE Maths Syllabus - Important topics and weightage

JEE Advanced Related Links

JEE Advanced 2024 Exam Dates

JEE Advanced 2024 Application

JEE Advanced 2024 Eligibility Criteria

JEE Advanced 2024 Syllabus

JEE Advanced 2024 Maths Syllabus

JEE Advanced 2024 Physics Syllabus

JEE Advanced 2024 Chemistry Syllabus

JEE Advanced Exam Result

JEE Advanced Exam Dates

JEE Advanced Registration Dates

CUET Related Links

CUET 2024 Eligibility Criteria

CUET 2024 Admit Card

CUET 2024 Exam Pattern

CUET 2024 FAQs

CUET 2024 Counselling

CUET 2024 Syllabus

CUET 2024 Result

CUET 2024 Answer Key

CUET 2024 Preparation


CUET 2024 Application Form

Talk to our expert
Resend OTP Timer =
By submitting up, I agree to receive all the Whatsapp communication on my registered number and Aakash terms and conditions and privacy policy