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建立人际资源圈Electrical_Topics
2013-11-13 来源: 类别: 更多范文
→ ELECTRON CHARGE : 1.602*10^-19 coulomb
→ ELECTRON MASS : 9.108*10^-31 kg
→ ELECTRIC CURRENT : flow of electron known as electric current
(3) temperature of conductor : R α t
(4) area of conductor : R α 1/a
→ EFFECT OF TEMPERATURE ON RESISTANCE :
CONDUCTOR : R α T {text:bookmark-start} {text:bookmark-start} Example of {text:bookmark-end} {text:bookmark-end} conductor : copper, aluminium
SEMI CONDUCTOR : R α 1/T Example of semi conductor : carbon , silicon , germanium
INSULATOR : R α 1/T Example of insulator :
→ OHM’S LAW : R = V/I
→ POWER : work/time – joule
1 micro watt = 10^-6 watt
1 milli watt = 10^-3 watt
1 kilo watt = 10^3 watt
1 mega watt = 10^6 watt
→ ENERGY : power * time
→ CONNECTION OF RESISTANCES IN SERIES : R = R1 + R2 + R3 + R4…………..
→ CONNECTION OF RESISTANCES IN PARALLEL : 1/R = 1/R1 + 1/R2 + 1/R3 + 1/R4…….
→ ACTIVE ELEMENT : EMF , CURRENT
→ PASSIVE ELEMENT : RESISTANCE
→ NETWORK :
→ NODE :
→ BRANCH :
→ KIRCHHOFF’S CURRENT LAW :
→ KIRCHHOFF’S VOLTAGE LAW :
→ SUPER POSITION THEOREM :
→ MAGNETIC FIELD :
→ FLUX DENSITY : B = Φ/A – wb/m^2
→ FLEMING’S LEFT HAND RULES : F = B I l
→ MAGNETOMOTIVE FORCE :
→ RELUCTANCE :
→ CONDUCTIVITY :
→ PERMEABILITY :
→ DIAMAGNETIC :
→ PARAMAGNETIC :
→ FERROMAGNETIC :
→ PERMEANCE :
→ LEAKAGE FLUX :
→ FRINGING :
→ FARADAY’S LAW :
→ CONDITION FOR PRODUCTION OF EMF :
→ DYNAMICALLY AND STATICALLY INDUCED EMF :
→ FLEMING’S RIGHT HAND RULES :
→ MUTUALLY INDUCED EMF :
→ PERMITTIVITY :
→ COULOMB’S LAW :
→ ELECTRIC FLUX :
→ CAPACITOR :
→ CAPACITANCE : C = Q/V
1µF = 10^-6 F
1µµF = 10^-12 F
1 Nf = 10^-9 F
→ TYPES OF CAPACITORE :
→ CAPACITORS IN SERIES : 1/C = 1/C1 + 1/C2 + 1/C3 + 1/C4…………..
→ CAPACITORS IN PARALLEL : C = C1 + C2 + C3 + C4………………….
→ CYCLE :
→ TIME PERIOD :
→ FREQUENCY ;
→ INSTANTANEOUS VALUE :
→ MAXIMUM VALUE :
→ RMS VALUE : 0.707 Im
→ AVERAGE VALUE : 0.637 Im
→ FORM FACTOR : 1.11
→ PEAK,CREST & AMPLITUDE FACTOR : 1.414
→ A.C. THROUGH PURE RESISTANCE :
→ A.C. THROUGH PURE CAPACITOR :
→ POWER FACTOR :
→ APPARENT POWER :
→ ACTIVE POWER :
→ REACTIVE POWER :
→ Q FACTOR OF A COIL :
→ SERIES RESONANCE :
→ ADVANTAGES OF THREE PHASE SYSTEM OVER SINGLE PHASE SYSTEM :
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