Resistors & Colour Coding What is Resistance Types of Resistors Resistors Resistors

Resistors & Colour Coding What is Resistance  Types of Resistors Resistors Resistors www.phwiki.com

Resistors & Colour Coding What is Resistance Types of Resistors Resistors Resistors

Violet Kennedy, Jenn, Executive Sports Producer has reference to this Academic Journal, PHwiki organized this Journal Resistors & Colour Coding Objectives: What is a Resistor Types of Resistor Parameters affecting resistance value Determine the resistance of a resistor using the color code. Discuss how exceeding its power rating can cause damage to a resistor. Discuss the use of a variable resistor as a potentiometer. What is Resistance the action of opposing something that you disapprove or disagree with; “he encountered a general feeling of resistance from many citizens”; “despite opposition from the newspapers he went ahead” any mechanical as long as ce that tends to retard or oppose motion electric resistance: a material’s opposition to the flow of electric current; measured in ohms the military action of resisting the enemy’s advance; “the enemy offered little resistance” immunity: (medicine) the condition in which an organism can resist disease Types of Resistors Resistors are made in many as long as ms but all belong in either of two groups: Fixed resistors – are made of metal films, high-resistance wire or carbon composition Variable resistors – have a terminal resistance that can be varied by turning a dial, knob, screw, or anything else appropriate as long as the application

San Jose Campus CA www.phwiki.com

This Particular University is Related to this Particular Journal

Resistors Fixed resistors have only one ohmic value, which cannot be changed or adjusted. One type of fixed resistor is the composition carbon resistor. Resistors Metal film resistors are another type of fixed resistor. These resistors are superior to carbon resistors because their ohmic value does not change with age in addition to they have improved tolerance. Resistors Carbon resistors are very popular as long as most applications because they are inexpensive in addition to readily available in st in addition to ard sizes in addition to wattages. ½ Watt 1 Watt 2 Watt

Resistors Wire-wound resistors are fixed resistors that are made by winding a piece of resistive wire around a ceramic core. These are used when a high power rating is required. Resistors Schematic symbols are used to represent various types of fixed resistors. Types of Resistors Variable resistors can have two or three terminals. Most have three. Variable resistors are classified as a rheostat or a potentiometer, depending upon the application. Rheostat: Two- or three-terminal device used as a variable resistor Potentiometer: Three-terminal device used as long as controlling potential levels

Resistors Variable resistors can change their value over a specific range. A potentiometer is a variable resistor with three terminals. A rheostat has only two terminals. Types of Resistors Most potentiometers have three terminals as shown. The knob, dial or screw in the center of the housing controls the motion of a contact that can move along the resistive element connected between the outer terminals. The contact is connected to the center terminal, establishing a resistance from a movable contact to each outer terminal. Types of Resistors The resistance between the outside terminals a in addition to c is always fixed at the full rated value of the potentiometer, regardless of the position of the wiper arm (b). The resistance between the wiper arm in addition to either outside terminal can be varied from a minimum of 0 to a maximum value equal to the full rated value of the potentiometer. The sum of the resistances between the wiper arm in addition to each outside terminal will equal the full rated resistance of the potentiometer

Factors affecting Resistance The resistance of any material with a uni as long as m cross-sectional area is determined by the following factors: Material Length Cross-sectional Area Temperature Resistance: Circular Wires The higher the resistivity of a conductor, the higher its resistance. The longer the length of a conductor, the higher its resistance. The lower the cross-sectional area of a conductor, the higher its resistance. The higher the temperature of a conductor, the higher its resistance Resistors The resistor color code can be used to determine the resistor’s ohmic value in addition to tolerance.

Color Coding Resistors Exceeding the power rating causes damage to a resistor. Resistors Review: Resistors are used in two main applications: as voltage dividers in addition to to limit the flow of current in a circuit. The value of fixed resistors cannot be changed. There are several types of fixed resistors such as composition carbon, metal film, in addition to wire-wound.

Resistors Review: Carbon resistors change their resistance with age or if overheated. Metal film resistors never change their value, but are more expensive than carbon resistors. The advantage of wire-wound resistors is their high power ratings. Resistors Review: Resistors often have b in addition to s of color to indicate their resistance value in addition to tolerance. Resistors are produced in st in addition to ard values. The number of values between 0 in addition to 100 is determined by the tolerance. Resistors Review: Variable resistors can change their value within the limit of their full value. 10. A potentiometer is a variable resistor used as a voltage divider.

Resistors Resistors are commonly used to per as long as m two functions in a circuit. The first use is to limit the flow of current in a circuit. I = E / R I = 15 V / 30 I = 0.5 A Resistors Resistors are commonly used to per as long as m two functions in a circuit. The second use is to produce a voltage divider. A to B = 1.5 V A to C = 7.5 V A to D = 17.5 V B to C = 6 V B to D = 16 V C to D = 10 V Brain Storming

Violet Kennedy, Jenn KTCT-AM Executive Sports Producer www.phwiki.com

Which materials is used as long as making wires Which material is most widely used in addition to why Which material is least used in addition to why

Violet Kennedy, Jenn Executive Sports Producer

Violet Kennedy, Jenn is from United States and they belong to KTCT-AM and they are from  San Francisco, United States got related to this Particular Journal. and Violet Kennedy, Jenn deal with the subjects like Entertainment; Sports

Journal Ratings by San Jose Campus

This Particular Journal got reviewed and rated by San Jose Campus and short form of this particular Institution is CA and gave this Journal an Excellent Rating.