آی پی امداد
آی پی امداد
آریا الکترونیک parcham تکشو

آموزشی: قطعه شناسی الکترونیک --فرمول های محاسباتی قطعات الکترونیک

xwhoogle

کاربران vip(افتخاری)
vip افتخاری
کاربر
فرمول های محاسباتی قطعات الکترونیک و مدار معادل ها
ولتاژ،جریان،مقاومت،وات W,R,I,V

201.gif


  • E = ولتاژ
  • I = جریان
  • R = مقاومت
    • E = I * R , محاسبه ولتاژ
    • I = E/R, محاسبه آمپر و جریان مدار
    • R = E/I, محاسبه مقاومت بر حسب اهم
سری، موازی مقاومت ها


  • نماد مقاومت= R : R1...R2...Rn
  • Rn = مقاومت های بیشتر
  • Rt = مقدار مقاومت کل
  • فرمول محاسبه مقاومت کل در حالت سری : Rt = R1 + R2 +R3....+ Rn
  • فرمول مقاومت کل درحالت موازی بودن دو مقاومت : Rt = ( R1 * R2)/(R1 + R2)
  • فرمول محاسبه مقاومت کل درحالت موازی بودن بیشتر از دو مقاومت: Rt = 1/ (1/R1 + 1/R2...+1/Rn)
  • 1/Rt = 1/R1 + 1/R2.....+1/Rn شکل دیگری از فرمول

سری، موازی سیم پیچ ها


  • Inductors are labeled by a # following the L : L1...L2...Ln
  • Ln = Continues for all the Inductors you have.
  • Lt = Inductance total
  • Inductors in SERIES add : Lt = L1 + L2 +L3....+ Ln
  • Two (2) Inductors in PARALLEL : Lt = ( L1 * L2)/(L1 + L2)
  • More than Two Inductors in PARALLEL: Lt = 1/ (1/L1 + 1/L2...+1/Ln)
  • Another form of this formula is : 1/Lt = 1/L1 + 1/L2.....+1/Ln
سری، موازی خازن ها


  • Capacitors are labeled by a # following the C : C1...C2...Cn
  • Cn = Continues for all the Capacitors you have.
  • Ct = Capacitance total
  • Capacitors in PARALLEL add : Ct = C1 + C2 +C3....+ Cn
  • Two (2) Capacitors in SERIES : Ct = ( C1 * C2)/(C1 + C2)
  • More than Two Capacitors in SERIES: Ct = 1/ (1/C1 + 1/C2...+1/Cn)
  • Another form of this formula is : 1/Ct = 1/C1 + 1/C2.....+1/Cn

فرمول های محاسبه توان


  • P = Power - measured in Watts
  • I = Current - measured in Amperes
  • E = Voltage - measured in Volts
  • R = Resistance - measured in Ohms
    • P = I * E, answer in Watts
    • P = I*I*R, answer in Watts
    • P = E*E/R, answer in Watts
راکتانس سیم پیچ ، خازن


  • Inductive Reactance
    • Pi =
      202.gif
      = 3.14
    • f = Frequency, in Hertz
    • L = Inductance of coil, in Henries
    • Xl = Inductive Reactance, in Ohms
      • 203.gif
        , answer in Ohms
      • Note: Xl is a linear function, it increases as frequency or inductor value increases.
  • Capacitive Reactance
    • Pi =
      202.gif
      = 3.14
    • f = Frequency, in Hertz
    • C = Capacitance in Farads
    • Xc = Capacitive Reactance, in Ohms
      • 204.gif
        , answer in Ohms
      • Note: Xc is inversely proportional to frequency and capacitance. If either frequency or capacitance increase, Xc decreases.
همگرایی در مدار سری: خازن، مقاومت، سلف


  • Resonance occurs when Xc and Xl are equal to each other.
    • Fo = Frequency of resonance, in Hertz
    • Pi =
      202.gif
      = 3.14
    • L = Inductance in Henries
    • C = Capacitance in Farads
    • 205.gif
    پهنای باند و فاکتور کیفیّت
  • Q = Quality Factor of the circuit.
  • BW = Bandwidth in Hertz
  • Xl = Inductive Reactance of the Inductor
  • R = Resistance of Inductor plus any external Resistance
  • Fo = Frequency of Resonance
    • Q = Xl / R, Quality Factor
    • BW = Fo / Q, measured in Hertz
    • Note: As Quality Factor increases the Bandwidth decreases, but, has more gain. And the opposite is true, as well. When the Quality Factor decreasesthe Bandwidth increases, but, has less gain.
طول موج


  • Wavelength is how long a wave is for a given Frequency.
  • The speed of light is 186,000 miles per second or about 300,000,000 meters per second.
  • f is the Frequency in Hertz/second (or Cycles/Second)
  • Wavelength = (300,000,000 meters/second) / ( f in Cycles/Second)
  • The answer is in meters/cycle

فرکانس و زمان


  • f is the Frequency in Hertz/Second or Cycles/Second
  • t is time in Seconds
  • f = 1/t , answer in Hertz/Second or Cycles/Second.
  • t = 1/f , answer in Seconds
امپدانس مدار


  • Xc = Capacitive Reactance, in Ohms
  • Xl = Inductive Reactance, in Ohms
  • R = Resistance, in Ohms
  • Z = Impedance, in Ohms
    • For a Capacitive circuit

    • 206.gif
      • For an Inductive Circuit

      • 207.gif
  • Rules for when you have a circuit with both Capacitive and Inductive Reactances
  • When Xl is larger than Xc use the formula in figure (a) , If Xc is Larger than Xl use the formula in Figure (b).

  • 208.gif
از استاد ایور مجیدی تنظیم : xwhoogleee حسین شفیعی
 
آخرین ویرایش:
بالا