ولتاژ،جریان،مقاومت،وات W,R,I,V
- 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 =
= 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.
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 =
= 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 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
- 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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