Describtion and Pratical Application of Electrical Components

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ID NO. : 2011001207
YEAR: 2011

|RESISTORS | |Resistors(R) are a two-terminal passive electronic component which implements electrical resistance as a circuit element. They are purposely placed in electric | |circuits to reduce voltage values and limit current flow. | |Resistors are the most fundamental and commonly used of all the electronic components. | |There are many different Types of Resistors available to the electronics constructor, from very small surface mount chip resistors up to large wirewound power | |resistors. | |The principal job of a resistor within an electrical or electronic circuit is to "resist" or to impede the flow of electrons through them by using the type of | |material that they are composed from. | |Resistors can also act as voltage droppers or voltage dividers within a circuit. | |[pic] | |A Typical Resistor | |Resistors are "Passive Devices", that is they contain no source of power or amplification but only attenuate or reduce the voltage signal passing through them. | |This attenuation results in electrical energy being lost in the form of heat as the resistor resists the flow of electrons through it. | |Then a potential difference is required between the two terminals of a resistor for current to flow. This potential difference balances out the energy lost. | |When used in DC circuits the potential difference, also known as a resistors voltage drop, is measured across the terminals as the circuit current flows through the | |resistor. | |“Most resistors are linear devices that produce a voltage drop across themselves when an electrical current flow through them because they obey Ohm's Law and | |different values of resistance produces different values of current or voltage. This can be very useful in Electronic circuits by controlling or reducing either the | |current flow or voltage produced across them.” | |There are many thousands of different Types of Resistors and are produced in a variety of forms. | |This is because of their particular characteristics and accuracy suit certain areas of application, such as High Stability, High Voltage, High Current etc, or are | |used as general purpose resistors where their characteristics are less of a problem. | |Some of the common characteristics associated with the humble resistor are;...