Circuits - ElectricalCircuits ElectricalCircuits...

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Electrical Circuits
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Electrical Circuits Nearly all branches of electrical engineering are  fundamentally based on circuit theory.  The only subject in electrical engineering that is  more fundamental than circuit theory is  electromagnetic field theory, which deals with the  physics of electromagnetic fields and waves.
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Electrical Circuits
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SI base units International System of Units  (SI from the French Syst è me international d'unit é s) Name Symbol length meter m mass kilogram kg time second s electriccurrent ampere A thermodynamictemperature kelvin K amount of substance mole mol luminousintensity candela cd SI base unit Base quantity
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plane angle radian (a) rad - m·m-1 =1 (b) solid angle steradian (a) sr (c) - m2·m-2 =1 (b) frequency hertz Hz - s-1 force newton N - m·kg·s-2 pressure, stress pascal Pa N/m2 m-1·kg·s-2 energy, work, quantity of heat joule J N·m m2·kg·s-2 power, radiant flux watt W J/s m2·kg·s-3 electriccharge, quantity of electricity coulomb C - s·A electricpotential difference, electromotive force volt V W/A m2·kg·s-3·A-1 capacitance farad F C/V m-2·kg-1·s4·A2 electricresistance ohm Omega V/A m2·kg·s-3·A-2 electricconductance siemens S A/V m-2·kg-1·s3·A2 magneticflux weber Wb V·s m2·kg·s-2·A-1 magneticflux density tesla T Wb/m2 kg·s-2·A-1 inductance henry H Wb/A m2·kg·s-2·A-2 Celsiustemperature degree Celsius °C - K luminousflux lumen lm cd·sr (c) m2·m-2·cd =cd illuminance lux lx lm/m2 m2·m-4·cd =m-2·cd activity (of aradionuclide) becquerel Bq - s-1 absorbed dose, specificenergy (imparted), kerma gray Gy J/kg m2·s-2 dose equivalent (d) sievert Sv J/kg m2·s-2 catalyticactivity katal kat s-1·mol SI derived unit
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Prefix Symbol Value pico P nano n micro µ mili m centi c deci d deca da hecto h kilo k mega M giga G tera T 12 10 - 9 10 - 6 10 - 3 10 - 2 10 - 1 10 - 1 10 2 10 3 10 6 10 9 10 12 10 SI prefixes
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Electrical Circuits The Ideal Basic Circuit Element Has Only two terminal It is described mathematically in terms of current and/or  voltage It cannot be subdivided into other elements An electrical circuit may be defined as two or more  Basic Circuit Elements interconnected by conductors. 
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Electrical Circuits In electrical circuits, there are numerous types of  electrical components such as resistors. capacitors.  inductors, diodes, transistors, transformers, batteries,  lamps. fuses, switches, and motors. 
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Electrical Circuits Electrical circuits can be very simple. such as the  circuit in a flashlight containing two batteries, a light  bulb and a switch. 
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Electrical Circuits The “conductors” that interconnect these components are  usually wires or metal pathways integrated on a printed  circuit hoard. 
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Electrical Circuits Most electrical circuits. however, are much more  complex than a flashlight. A standard television 
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