Resistivity and Resistance Formula, Conductivity, Temperature Coefficient, Physics Problems
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This physics video tutorial explains the concept of resistivity and resistance of electrical conductors like copper and silver as well as semiconductors such as silicon, germanium, and carbon graphite. It provides the formula to calculate the resistance of a metal or wire using resistivity. It discusses the inverse relationship between resistivity and conductivity as well the direct relationship between resistance and temperature. Electrical conductors such as metals have a positive temperature coefficient of resistivity which means that as the temperature of a metal increases, the resistivity will increase and the conductivity will decrease. For metalloids or semiconductors, the opposite is true. These elements have a negative temperature coefficient which means that the resistance will decrease as the temperature increases which correlates to an increase in conductivity. The resistivity depends on the length of the wire as well as the cross sectional area. Long wires have more resistance and short wires conduct electricity better. Thick wires have less resistance than thin wires. This video shows you how to calculate the temperature by simply measuring the current in a metal using a known voltage which has practical applications in digital thermometers.
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Correction: Correction: 2:53 \”first layer is the anode\” should say \”first layer is the cathode\”
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Resistivity
Open vs. closed circuits are demonstrated. Conductors and insulators are shown in circuits. Resistivity is defined and the equation is analyzed. Resistivities of common materials are shown. Semiconductors are discussed. The temperature dependence of the resistivities of materials is demonstrated. Want Lecture Notes? https://www.flippingphysics.com/resistivity.html This is an AP Physics 1/JEE/NEET Topic.
0:00 Open vs. closed circuits
1:33 Resistivity demonstration
4:42 Conductors vs. insulators
5:31 The equation for resistivity
7:55 Resistivities of common materials
9:01 Semiconductors
10:00 Resistivity depends on temperature
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APPhysics1 JEE NEET
Electrical Conductivity | #aumsum #kids #science #education #children
Electrical conductivity is the ability of a material to conduct electricity.
Take an electrical circuit consisting of a bulb, cell, wire and a switch.
Connect wood to the circuit.
The bulb does not glow indicating that wood is a poor conductor of electricity.
Connect a paper roll to the circuit.
The bulb does not glow, indicating that paper is also a poor conductor of electricity.
Take a metal like iron and connect it in the same circuit.
The bulb glows indicating that iron is a good conductor of electricity.
Similarly, other metals like copper, silver, etc. also make good conductors of electricity.
Hence, we can say that most metals are good conductors of electricity.
Resistivity, Resistance and Conductivity
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