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. Electric Current In Circuits: https://www.youtube.com/watch?v=r-SCyD7f_zI The Electric Battery: https://www.youtube.com/watch?v=xrf6I_5vX64 Ohm's Law Problems: https://www.youtube.com/watch?v=NxxNu9Cek1E Resistor Color Code: https://www.youtube.com/watch?v=G1mZutobxDU ______________________________ Internal Resistance of a Battery: https://www.youtube.com/watch?v=R1QN_0fcZ_8 Electromotive Force of a Battery: https://www.youtube.com/watch?v=k077CwKGiwk Drift Velocity and Current Density: https://www.youtube.com/watch?v=KiTkSZy79cw Potential Difference Between Two Points: https://www.youtube.com/watch?v=vcbkvYDP5a8 Alternating Current Vs Direct Current: https://www.youtube.com/watch?v=ERIToctYUcQ ______________________________ Schematic Diagrams & Symbols: https://www.youtube.com/watch?v=Dl1gFBNa0Ik Open, Closed, and Short Circuits: https://www.youtube.com/watch?v=v5RJf_V0LYA Resistors In Series: https://www.youtube.com/watch?v=9z53qVQjasU Resistors In Parallel: https://www.youtube.com/watch?v=SYrOiQs3X2U Physics PDF Worksheets: https://www.video-tutor.net/physics-basic-introduction.html