RLC circuit

Discussion in 'General Electronics Chat' started by acw_wellsy, Oct 1, 2006.

  1. acw_wellsy

    Thread Starter New Member

    Oct 1, 2006
    3
    0
    consider a series RLC circuit in which R is an incandescent lamp, C is some fixed capacitor, and L is a variable inductance. the source is 240 volts AC. Explain why the lamp glows brightly for some values of L and does not glow at all for other values???

    cheers
     
  2. richbrune

    Senior Member

    Oct 28, 2005
    106
    0
    Inductors and capacitors in the right combination will allow more current to pass through them in what is called "resonance". Let's take an example of a .001 farad capacitor, in a 60hz series circuit, and find what inductor will allow the bulb to go brightest. L=1/(39.5*60*60*.001)=.00703 or about 7mH. If you move the variable inductor away from the 7mH value in either direction, the bulb will go dimmer.
     
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