Saturday, September 26, 2015

Capacitor and Inductor

Capacitor and Inductor

Capacitor

         Capacitor consists of two or more parallel conductive (metal) plates which are not connected or touching each other, but are electrically separated either by air or by some form of a good insulating material such as waxed paper, mica, ceramic, plastic or some form of a liquid gel as used in electrolytic capacitors. The insulating layer between a capacitors plates is commonly called the Dielectric.
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Inductor

         An inductor is a passive electronic component that storesenergy in the form of a magnetic field. In its simplest form, an inductor consistsof a wire loop or coil. The inductance is directly proportional to the number ofturns in the coil. Inductance also depends on the radius of the coil and on the type of material around which the coil is wound.

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First Order Circuits: Source Free RC/RL Circuit

First Order Circuits: Source Free RC/RL Circuit

    A first-order circuit can only contain one energy storage element (a capacitor or an inductor). The circuit will also contain resistance.
So there are two types of first-order circuits:
RC circuit
RL circuit

RC

Formula for V voltage response of the RC circuit is an exponential decay of the initial voltage. Vo at time t=0
 
RC Time constant


RL


Formula for I current response of the RL circuit is an exponential decay of the initial current. Io at time to=0

RL Time constant







Saturday, September 19, 2015

Maximum power transfer

Maximum power transfer


   Maximum power transfer theorem determines the value of resistance RL for which, the maximum power will be transferred from source to it. Actually the maximum power, drawn from the source, depends upon the value of the load resistance. There may be some confusion let us clear it. maximum power transfer therom]