project on to show that the temperature is directly proportional to resistance........i need procedure with diagram
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In this article I will investigate what affects the resistance of a wire.
Electricity flows in metals. Metal wires are made of millions of tiny metal crystals, and each crystal’s atoms are arranged in a regular pattern. The metal is full of "free" electrons that do not stick to any particular atom; rather, they fill the space between the atoms. When these electrons move, they create an electric current.
Conductors have resistance, but some are worse than others. The free electrons keep bumping into atoms. A wire's resistance depends on four main factors:
ResistivityLength of the wireCross-sectional areaTemperature of the wire
I will investigate how the length of the wire affects the resistance. I have done a preliminary experiment to help me decide the best way to do my investigation. The results will help me make predictions.
Electricity flows in metals. Metal wires are made of millions of tiny metal crystals, and each crystal’s atoms are arranged in a regular pattern. The metal is full of "free" electrons that do not stick to any particular atom; rather, they fill the space between the atoms. When these electrons move, they create an electric current.
Conductors have resistance, but some are worse than others. The free electrons keep bumping into atoms. A wire's resistance depends on four main factors:
ResistivityLength of the wireCross-sectional areaTemperature of the wire
I will investigate how the length of the wire affects the resistance. I have done a preliminary experiment to help me decide the best way to do my investigation. The results will help me make predictions.
sunny627:
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This article is about specific applications of conductivity and resistivity in electrical elements. For other types of conductivity, see Conductivity. For electrical conductivity in general, see Electrical resistivity and conductivity.
"Resistive" redirects here. For the term used when referring to touchscreens, see Resistive touchscreen.
In electronics and electromagnetism, the electrical resistance of an object is a measure of its opposition to the flow of electric current. The reciprocal quantity is electrical conductance, and is the ease with which an electric current passes. Electrical resistance shares some conceptual parallels with the notion of mechanical friction. The SI unit of electrical resistance is the ohm (Ω), while electrical conductance is measured in siemens (S) (formerly called “mho”s and then represented by ℧).
The resistance of an object depends in large part on the material it is made of. Objects made of electrical insulators like rubber tend to have very high resistance and low conductivity, while objects made of electrical conductors like metals tend to have very low resistance and high conductivity. This relationship is quantified by resistivity or conductivity. The nature of a material is not the only factor in resistance and conductance, however; it also depends on the size and shape of an object because these properties are extensive rather than intensive. For example, a wire's resistance is higher if it is long and thin, and lower if it is short and thick. All objects resist electrical current, except for superconductors, which have a resistance of zero.
The resistance R of an object is defined as the ratio of voltage V across it to current I through it, while the conductance G is the reciprocal:
{\displaystyle R={V \over I},\qquad G={I \over V}={\frac {1}{R}}}
For a wide variety of materials and conditions, V and I are directly proportional to each other, and therefore R and G are constants (although they will depend on the size and shape of the object, the material it is made of, and other factors like temperature or strain). This proportionality is called Ohm's law, and materials that satisfy it are called ohmic materials.
In other cases, such as a transformer, diode or battery, V and I are not directly proportional. The ratio V/I is sometimes still useful, and is referred to as a chordal resistance or static resistance,[1][2] since it corresponds to the inverse slope of a chord between the origin and an I–V curve. In other situations, the derivative {\displaystyle {\frac {\mathrm {d} \,V}{\mathrm {d} \,I}}\,\!} may be most useful; this is called the differential resistance.
"Resistive" redirects here. For the term used when referring to touchscreens, see Resistive touchscreen.
In electronics and electromagnetism, the electrical resistance of an object is a measure of its opposition to the flow of electric current. The reciprocal quantity is electrical conductance, and is the ease with which an electric current passes. Electrical resistance shares some conceptual parallels with the notion of mechanical friction. The SI unit of electrical resistance is the ohm (Ω), while electrical conductance is measured in siemens (S) (formerly called “mho”s and then represented by ℧).
The resistance of an object depends in large part on the material it is made of. Objects made of electrical insulators like rubber tend to have very high resistance and low conductivity, while objects made of electrical conductors like metals tend to have very low resistance and high conductivity. This relationship is quantified by resistivity or conductivity. The nature of a material is not the only factor in resistance and conductance, however; it also depends on the size and shape of an object because these properties are extensive rather than intensive. For example, a wire's resistance is higher if it is long and thin, and lower if it is short and thick. All objects resist electrical current, except for superconductors, which have a resistance of zero.
The resistance R of an object is defined as the ratio of voltage V across it to current I through it, while the conductance G is the reciprocal:
{\displaystyle R={V \over I},\qquad G={I \over V}={\frac {1}{R}}}
For a wide variety of materials and conditions, V and I are directly proportional to each other, and therefore R and G are constants (although they will depend on the size and shape of the object, the material it is made of, and other factors like temperature or strain). This proportionality is called Ohm's law, and materials that satisfy it are called ohmic materials.
In other cases, such as a transformer, diode or battery, V and I are not directly proportional. The ratio V/I is sometimes still useful, and is referred to as a chordal resistance or static resistance,[1][2] since it corresponds to the inverse slope of a chord between the origin and an I–V curve. In other situations, the derivative {\displaystyle {\frac {\mathrm {d} \,V}{\mathrm {d} \,I}}\,\!} may be most useful; this is called the differential resistance.
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