Technical articles on Electronics and Electrical Engineering topics focused on Basics of EE, Electronic components, power systems and equipment used for generation, transmission, operation, and controls of electricity.
Insulated gate field-effect transistors are unipolar devices just like JFETs: that is, the controlled current does not have to cross a PN junction. There is a PN junction inside the transistor, but its only purpose is to provide that nonconducting depletion region which is used to restrict current through the channel. Here is a diagram … Read more
The video explains the working of halogen, fluroscent, and LED light bulbs.
What’s inside a 365 kV substation? This video presents the components and power installation inside a 365 kV substation.
A transistor is a linear semiconductor device that controls current with the application of a lower-power electrical signal. Transistors may be roughly grouped into two major divisions: bipolar and field-effect. In the last chapter we studied bipolar transistors, which utilize a small current to control a large current. In this chapter, we’ll introduce the general concept of the field-effect transistor … Read more
Fusing factor is the ratio of minimum fusing current to the current rating of the fusing element. Mathematical Formula Fusing factor Formula = Minimum fusing current / Current rating of fuse element Good to know
An ideal transistor would show 0% distortion in amplifying a signal. Its gain would extend to all frequencies. It would control hundreds of amperes of current, at hundreds of degrees C. In practice, available devices show distortion. Amplification is limited at the high frequency end of the spectrum. Real parts only handle tens of amperes … Read more
Like all electrical and electronic devices, the transistor has its own limitations. Given below are top 10 transistor ratings. Power dissipation When a transistor conducts current between collector and emitter, it also drops voltage between those two points. At any given time, the power dissipated by a transistor is equal to the product (multiplication) of … Read more
Even wondered how your cell phone is Engineered? This video presents the Electrical Engineering inside your cell Phone.
An often-used circuit applying the bipolar junction transistor is the so-called current mirror, which serves as a simple current regulator, supplying nearly constant current to a load over a wide range of load resistances. We know that in a transistor operating in its active mode, collector current is equal to base current multiplied by the ratio … Read more
Input impedance varies considerably with the circuit configuration shown in Figure below. It also varies with biasing. Not considered here, the input impedance is complex and varies with frequency. For the common-emitter and common-collector it is base resistance times β. The base resistance can be both internal and external to the transistor. For the common-collector: … Read more