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…
Category: Learning
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…
Three-phase circuits
Three-phase circuits of voltage supplies are the three connected voltage supplies, with the same magnitude of amplitude and frequency, but shifted to 120 grad.…
Periodic non-sinusoidal currents in linear circuits
Periodic non-sinusoidal currents and voltages are those that change in a periodical non-sinusoidal way. It may happen when the source is generating non-sinusoidal signals, and…