Energy band theory is a basis for describing processes and effects in solid crystals under electromagnetic field impact. Energy band theory is a theory…
Category: Learning
Complex conductance. Active and reactive power
Complex conductance Y is the value, reverse to the complex resistance Z, where Y=1Z=ye-jφ. Complex conductance is measured with Siemens (1Ohm), Y=1R+jX=R-jXR2+X2=RR2+X2-j XR2+X2. Ohm Law’s using the conductivity…
Two-terminal networks in the AC circuit
Let's consider a passive two-terminal network, connected to the input source E. The input resistance in this case is Zin=EI, Zin=Rin+jXin, the input conductance is Yin=1Zin. If the Xin<0, then…
Induction motor
An induction motor is a type of electric machine. Here the stator coils produce a magnetic field, and this magnetic field induces a current,…
Equivalent two-terminal network
Equivalent two-terminal transformations are transformations that lead to the simplification of complex two-terminal networks with the smallest amount of L, C and R elements. These equivalent networks…
Magnetically related networks – transformers
Often networks contain magnetic elements, for example coils, that can create magnetic induction in the other close placed coils, generating the self-induction EMF. Let's…
Conductors and their properties
Electric conductors can be solids, liquids and even gases. Solid conductors are metals, metal alloys and some carbon modifications. Metals are plastic compounds with…
Four-terminal networks
Four-terminal network is an abstract element of an electrical circuit, having four terminals - two-input and two-output. The four-terminal network is depicted below. If…
Semiconductors and their properties
Semiconductors are a class of materials with electron conductivity. Their resistance value is between metal and insulator resistances at normal temperatures. The main feature…
Electronic filter
Electronic filters are four-terminal devices that serve to transfer electrical current between the source and load in a certain frequency range. The transparency range…