Definition: PNP transistor is three terminal current controlled device which consists of three terminals formed by sandwiching a layer of N-type material between the two P-type semiconductors. It acts as a current sink because all the emitter current sinks into the base terminal. PNP transistor can also be understood as positive – negative – positive transistor. The majority charge carriers involved in the conduction process of PNP transistor are holes. Thus, the current which generates at … [Read more...] about PNP Transistor
Transistor
Definition: The word Transistor is formed from two words, one is “Transfer” and other is “Varistor”. This implies a device which transfers resistance from one channel of the circuit to other is called transistor. It is a three terminal current controlled device which can either be operated as switch or amplifier by providing small signal voltage. It is one of the significant types of active devices. Significance and History of Transistor You must be thinking what is the need of … [Read more...] about Transistor
Difference between Voltmeter and Ammeter
A voltmeter is an instrument which measures the voltage between two points of a circuit while Ammeter measures the current flowing in the circuit. Voltage is measured in Volts while Current is measured in Amperes. Thus, the unit in which voltmeter measures the voltage is volt while the unit in which ammeter measures the instrument is Ampere. The other significant difference between Voltmeter and Ammeter is connection architecture. The voltmeter is connected parallel across the load when we … [Read more...] about Difference between Voltmeter and Ammeter
Difference between AC and DC
AC is an acronym of Alternating Current while DC is an acronym of Direct Current. The major difference between AC and DC is that DC is unidirectional current while AC is bidirectional Current. DC is constant with time while AC changes at every instant of time. The major drawback of using DC is, it starts deteriorating with distance. The power supplied by DC source is not convenient for long distance as it will diminish with the increment in the distance. This is not the case with AC. Thus it … [Read more...] about Difference between AC and DC
Difference between LED and Photodiode
The LED operates on the principle of electro-luminance while photodiode works on the principle of the photoconduction. In a Light emitting diode, when electrons and holes recombine, the energy is released in the form of light. Thus, it is termed as Light-emitting diode. On the contrary, photodiode generates current when it is exposed to the source of light. LED and Photodiode are reverse of each other. LED generates light with the help of charge carriers while photodiode generates current due … [Read more...] about Difference between LED and Photodiode
Difference between Centre Tapped and Bridge Rectifier
The crucial thing which differentiates Centre Tapped and Bridge Rectifier is the design architecture. Centre tapped Rectifier consists of two diodes which are connected to the centre tapped secondary winding of the transformer as well as with the load resistor. Bridge rectifier comprises of 4 diodes which are connected in the form of Wheat stone bridge and thus provide full wave rectification. The advantage of using Bridge rectifier is that no centre tapping is required. Thus, we can … [Read more...] about Difference between Centre Tapped and Bridge Rectifier
Difference Between Analog and Digital Communication
The crucial difference between Analog and Digital Communication is that Analog communication uses analog signals for transmission and reception of data while digital communication uses digital signals for transmitting and receiving data. Analog signals are the continuous time-varying signal while digital signals are those which consist of discrete values. Digital communication provides various advantages such as it is immune to noise and distortion as it possesses greater signal to noise … [Read more...] about Difference Between Analog and Digital Communication
Difference between LED and LASER
The significant difference between LED and LASER lies in the working principle. LED emits light as the consequence of charge carriers recombination across P-N Junction, while LASER emits light as a result of photons striking the atom and compels them to release the similar photon. A laser works on the principle of stimulated emission and LED works on the principle of Electro-luminance. Thus, in LASER every released photon strike another atom to release similar photon and therefore, the beam … [Read more...] about Difference between LED and LASER
Difference Between Zener and Avalanche Breakdown
The crucial difference between the Zener and Avalanche breakdown is the operating mechanism. Zener breakdown occurs when the high electric field is created across the junction. On the other hand, Avalanche Breakdown occurs in the device due to the collision of electrons moving at high speed. In Zener breakdown, the increase in reverse voltage causes the expansion of the depletion layer. The more the width of the depletion region the more will be the electric field across the … [Read more...] about Difference Between Zener and Avalanche Breakdown
Difference Between Half Wave and Full Wave Rectifier
The Half Wave and Full Wave Rectifier have significant differences. A rectifier converts AC voltage into Pulsating DC voltage. A Half-Wave rectifier is an electronic circuit which converts only one-half of the AC cycle into pulsating DC. It utilizes only half of AC cycle for the conversion process. On the other hand, Full wave rectifier is an electronic circuit which converts entire cycle of AC into Pulsating DC. The Half-Wave Rectifier is unidirectional; it means it will allow the conduction … [Read more...] about Difference Between Half Wave and Full Wave Rectifier