ELECTRONICS BASICS AND REFERENCE INFORMATION |
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THE BASIC ELECTRONIC CONCEPTSElectronics engineering deals with the design, analysis and applications of electronic circuits. A circuit is a collection of components connected by conductors that forms a closed path through which an electric current can flow to achieve a particular functionality. The flow of the charges is influenced by electric field. When a charged particle moves in the field from point A to point B, a specific work done on this particle by electrical forces and as a result its potential energy changes. This work per unit charge is called voltage: V=W/Q. Voltage is measured in volts (1 V is 1 joule per coulomb). Since power in general is work per unit time, the amount of power transfer (i.e., rate at which electric energy is transformed by the flow of current) is then given by the equation P = W/t = V×Q/t = V×I. BASIC ELECTRONIC COMPONENTSBasic components used in electronics are classified into passive (such as resistors, capacitors and inductors) or active (such as transistors and diodes). For the purpose of circuit design and analysis we normally replace real objects by so-called lumped circuit abstractions. These abstractions are idealized elements that capture some essential aspects of real device operation and that allows us to view a circuit as a set of discrete or "lumped" elements. An ideal resistor is defined as an element for which the ratio of voltage divided by current is constant. This constant ratio is called resistance: R=V/I. A resistor is dissipative element: it does not store energy, but simply removes it from the circuit.
i(t)=C×ΔV(t)/Δt. An inductor is an two-terminal element resisting any change of electric current through it. An ideal inductor has zero resistance and in a steady state mode has zero DC voltage across its terminals. When AC current passes through an inductor, the AC voltage that appears across its terminals is due to its own magnetic field and Faraday's law of electromagnetic induction: V(t)=L×Δi(t)/Δt. Below you find additional infomation on electronics, circuit design and analysis as well as learning and career resources. |
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REFERENCE
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JOBS AND SCHOOLS |
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BASIC ELECTRONIC
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Electronic parts cross-reference and online datasheet search Electrical Engineering reference, basic circuit theorems, online textbooks Magnetic units- conversion tables, equations and calculators Power and energy units online conversion R, L and C impedances, and formulas for series and parallel connections |
Engineering Jobs (SMPS design and other) Accredited online schools and degree programs PCB layout jobs Power supply design jobs |
OpAmp circuit collection Digital Logic basics Digital electronics guide: ADC & DAC basics, sampling theorem, Fourier Transform, FFT Electronic circuit concepts and main equations Circuit simulators |
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© 2010 Lazar Rozenblat |
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