N4 Electricity and Energy summary notes
... - Identification and use a range of electrical and electronic components to construct practical electronic circuits and systems. - Current and voltage relationships in a series circuit. - Practical applications of series and parallel circuits. - Qualitative factors that affect resistance. Use of the ...
... - Identification and use a range of electrical and electronic components to construct practical electronic circuits and systems. - Current and voltage relationships in a series circuit. - Practical applications of series and parallel circuits. - Qualitative factors that affect resistance. Use of the ...
chapter 20: electric current, resistance, and ohm`s law
... (c) In part (a), the temperature is above the melting point of any metal. In part (b) the temperature is far below 0 K , which is impossible. (d) The assumption that the resistivity for constantan ...
... (c) In part (a), the temperature is above the melting point of any metal. In part (b) the temperature is far below 0 K , which is impossible. (d) The assumption that the resistivity for constantan ...
Lecture Magnetic Circuit
... placed in the flux paths surrounding a permanent magnet, an almost unnoticeable change occurs in the flux distribution if a magnetic material, such as soft iron, is placed in the flux path, the flux lines pass through the soft iron rather than the surrounding air because flux lines pass with greate ...
... placed in the flux paths surrounding a permanent magnet, an almost unnoticeable change occurs in the flux distribution if a magnetic material, such as soft iron, is placed in the flux path, the flux lines pass through the soft iron rather than the surrounding air because flux lines pass with greate ...
why do magnetic forces depend on who
... interpreted as the effect of the Lorentz force on moving electrons inside atoms. We know now that electrons in atoms jumping between energy levels produce spectral lines, so any affect on the way they move shows up in a shift of the lines. Today we regard the spinning electrons inside atoms as exist ...
... interpreted as the effect of the Lorentz force on moving electrons inside atoms. We know now that electrons in atoms jumping between energy levels produce spectral lines, so any affect on the way they move shows up in a shift of the lines. Today we regard the spinning electrons inside atoms as exist ...
Prediction of half-metallic properties in TlCrS2 and TlCrSe2 based
... The total magnetic moment obtained from spin polarized calculations is 3 μB for TlCrS2 and TlCrSSe, but for TlCrSe2 total magnetic moment slightly deviate from integer value. Spin polarized results predict strictly half-metallic behavior for TlCrS2 and TlCrSSe. We suppose that this compounds may be ...
... The total magnetic moment obtained from spin polarized calculations is 3 μB for TlCrS2 and TlCrSSe, but for TlCrSe2 total magnetic moment slightly deviate from integer value. Spin polarized results predict strictly half-metallic behavior for TlCrS2 and TlCrSSe. We suppose that this compounds may be ...
2013_final_exam
... A cloud-to-ground lightning discharge has a duration that is usually less than 1 second. Why does the thunder last much longer than that? Summarize as completely as you can the physical characteristics of the first return stroke in a negative cloud-to-ground discharge. Briefly explain how satellite ...
... A cloud-to-ground lightning discharge has a duration that is usually less than 1 second. Why does the thunder last much longer than that? Summarize as completely as you can the physical characteristics of the first return stroke in a negative cloud-to-ground discharge. Briefly explain how satellite ...
Current can produce magnetism.
... can move objects in any direction. For example, electric motors move power windows in a car up and down. Motors can be very large, such as the motors that power an object as large as a subway train. They draw electric current from a third rail on the track or wires overhead that carry electric curre ...
... can move objects in any direction. For example, electric motors move power windows in a car up and down. Motors can be very large, such as the motors that power an object as large as a subway train. They draw electric current from a third rail on the track or wires overhead that carry electric curre ...
Electric field = force per charge
... Lines indicate the strength and direction of the electric field. The more dense the lines, the stronger the field. ...
... Lines indicate the strength and direction of the electric field. The more dense the lines, the stronger the field. ...
Lecture 5
... LS coupling assumption (good for light atoms) implies that the total angular momentum J is just the (vector) sum of L+S The magnetic quantum number M takes on values of J, J-1, …, 0, …-J-1, -J An atomic level is described as: n2S+1LJ, where 2S+1 is called the “multiplicity” (inner full shells sum to ...
... LS coupling assumption (good for light atoms) implies that the total angular momentum J is just the (vector) sum of L+S The magnetic quantum number M takes on values of J, J-1, …, 0, …-J-1, -J An atomic level is described as: n2S+1LJ, where 2S+1 is called the “multiplicity” (inner full shells sum to ...
Superconductivity
Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In ordinary conductors, such as copper or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.In 1986, it was discovered that some cuprate-perovskite ceramic materials have a critical temperature above 90 K (−183 °C). Such a high transition temperature is theoretically impossible for a conventional superconductor, leading the materials to be termed high-temperature superconductors. Liquid nitrogen boils at 77 K, and superconduction at higher temperatures than this facilitates many experiments and applications that are less practical at lower temperatures.