report 4... - Report of 3rd Experiment Capacitor...

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Report of 3 rd Experiment Capacitor
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CAPACITANCE: Capacitance is the ability of a body to hold an electrical charge. Capacitance is also a measure of the amount of electrical energy stored (or separated) for a given electric potential . A common form of energy storage device is a parallel-plate capacitor . In a parallel plate capacitor, capacitance is directly proportional to the surface area of the conductor plates and inversely proportional to the separation distance between the plates. If the charges on the plates are + Q and − Q , and V gives the voltage between the plates, then the capacitance is given by The SI unit of capacitance is the farad ; 1 farad is 1 coulomb per volt . TRANSFORMER: A transformer is a static device that transfers electrical energy from one circuit to another through inductively coupled conductors—the transformer's coils. A varying current in the first or primary winding creates a varying magnetic flux in the transformer's core and thus a varying magnetic field through the secondary winding. This varying magnetic field induces a varying electromotive force (EMF) or " voltage " in the secondary winding. This effect is called mutual induction . If a load is connected to the secondary, an electric current will flow in the secondary winding and electrical energy will be transferred from the primary circuit through the transformer to the load. In an ideal transformer, the induced voltage in the secondary winding ( V s ) is in proportion to the primary voltage ( V p ), and is given by the ratio of the number of turns in the secondary ( N s ) to the number of turns in the primary ( N p ) as follows: By appropriate selection of the ratio of turns, a transformer thus allows an alternating current (AC) voltage to be "stepped up" by making N s greater than N p , or "stepped down" by making N s less than
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This note was uploaded on 05/11/2011 for the course UBIT 411 taught by Professor Saleemelahi during the Spring '10 term at University of Karachi.

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report 4... - Report of 3rd Experiment Capacitor...

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