demo04 - Class 4 - Demonstrations of Resistance Like...

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Class 4 --- Demonstrations of Resistance Like capacitors, resistors come in many shapes and sizes to suit  the application.  We've shown just a few examples. Most  electronics circuits use small "carbon resistors".  These are  cylindrically shaped with wires coming from either end.  Usually  they have colored bands which are a code for what the value of  the resistance is.  They are called "carbon" resistors because inside  is a small cylinder of carbon, the size and shape of which  determine the resistance.   Power Resistors are typically lengths of a thick wire wound around a  ceramic tube in order to allow large currents to flow without melting the  resistor.  They can get very hot.  An electric stove or heating element is a type  of power resistor designed to make use of the high heat generated. Wire Wound  Resistors, sometimes called "rheostats", are made of a  long length a wire wound around a ceramic tube,  designed to allow you to choose any value of resistance  up to the maximum by tapping into the total length at  various places. Varying the length of the wire used, like  this, changes the total resistance according to:    Resistance = (resistivity) (LENGTH)   Area These "rheostats" can be round "donuts", like what is  used in volume control for radio (except much smaller), 
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This note was uploaded on 09/17/2008 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.

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demo04 - Class 4 - Demonstrations of Resistance Like...

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