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Reactance:
Capacitors and inductors (coils), when connected to an AC voltage source, oppose the flow of electrical current. The amount of opposition depends on the value of the component (capacitor or inductor) and the applied frequency. Capacitors block direct current and tend to block lower frequencies. Inductors pass low frequencies with little or no opposition and tend to block higher frequencies. In theory a perfect inductor or capacitor has no resistance. The reactance of a capacitor or inductor is similar to the resistance of a resistor. The biggest difference is that a resistor opposes AC equally as frequency changes. The reactance of a coil (inductor) or capacitor changes with frequency.

Use this program to calculate the reactance for inductors and capacitors at various frequencies. You should notice that the reactance increases for inductors as the frequency increases. The reactance for the capacitor decreasesas the frequency increases.
Data Input:
Capacitor Value? microfarads
Inductor Value? millihenries
Test Frequency? hertz
Data Output:
Capacitive Reactance = ohms
Inductive Reactance = ohms

Capacitive Reactance = 
1
2*3.14*applied frequency*capacitor value

Inductive Reactance = 2*3.14*applied frequency*inductor value

 

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