• 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 

• 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

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• 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

• 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

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• 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

• Inductive Reactance
  
  • Pi = = 3.14
  • f = Frequency, in Hertz
  • L = Inductance of coil, in Henries
  • Xl = Inductive Reactance, in Ohms
    • , answer in Ohms
    • Note: Xl is a linear function, it increases as frequency or inductor value increases.
• Capacitive Reactance
  
  • Pi = = 3.14
    
  • f = Frequency, in Hertz
  • C = Capacitance in Farads
  • Xc = Capacitive Reactance, in Ohms
    
    • , answer in Ohms
    • Note: Xc is inversely proportional to frequency and capacitance. If either frequency or capacitance increase, Xc decreases.

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• Resonance occurs when Xc and Xl are equal to each other.
  • Fo = Frequency of resonance, in Hertz
    
  • Pi = = 3.14
  • L = Inductance in Henries
  • C = Capacitance in Farads
    
  • 

  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 decreases the Bandwidth increases, but, has less gain.

• 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

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• 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

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

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• 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).
  
  
• 

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