of light. The photoelectric effect we know today is due to the significant contributions of many people. These people include Nikola Tesla‚ A. E. Becquerel‚ and Heinrich Hertz. Becquerel observed the photoelectric effect via an electrode in a conductive solution exposed to light. He was one of the first people to observe the photoelectric effect. Nikola Tesla worked on the photoelectric effect in 1901. He later filed a patent for the Apparatus for the Utilization of Radiant Energy. This basically
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works as shown in the diagrams below. DC motors. A simple DC electric motor. When the coil is powered‚ a magnetic field is generated around the armature. The left side of the armature is pushed away from the left magnet and drawn toward the right‚ causing rotation. The armature continues to rotate. When the armature becomes horizontally aligned‚ the commutator reverses the direction of current through the coil‚ reversing the magnetic field. The process then repeats. Single-phase AC induction motors
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that when a copper pick-up coil is placed inside a solenoid whose magnetic field varies with time‚ current will flow in this coil even if there is no voltage source physically connected to it. This kind of induced emf is seen everywhere in the modern world in the propagation of light and radio waves‚ in transformers and generators‚ or in induction coils that give the spark for the car engine. The induced emf is proportional to the number of turns Nc in the “pick-up” coil and is related to the rate
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calculate the percentage error. This lab requires the use of two important pieces of equipment: the Helmholtz Coils and the deflection tube. The Helmholtz coils are used to generate the constant magnetic field.
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classroom. 2. On the ends of the variable gap magnet there were two small magnetic disks. One arm of the magnet was unscrewed and removed from its housing. A meter stick was placed on the and the arm was on its side parallel to the meter stick. The Gauss-Tesla meter was used to measure the field strength of the magnet. The probe attached to the meter was perpendicular to the meter stick. There were 4 steps to this process: a. The field strength was measured with the probe flat against the magnetic disk
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constant B field can be detected by a small compass. If the current in the wire is time-varying‚ the B field that exists will also be time-varying. This time-varying B field can be detected by the electric field that it induces in a small inductor coil placed near the wire. In this laboratory‚ measurements on an apparatus with a long straight current-carrying wire will be used to accomplish the following objectives: 1.1 Determination of the direction of the B field surrounding a long straight
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Few events in the state of Texas are as prestigious as the annual Texas Tech University Commencement. Last December‚ I was fortunate enough to be selected as one of the speakers for at the Bachelor’s ceremony. Knowing that on that day‚ I would be looked upon by hundreds of young and hard-working students‚ I pondered what message I would give them. What could inspire these young-adults‚ these graduates‚ who are brimming with the potential to change‚ innovate‚ and shape our world? The answer‚ it
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current from a wall outlet) is placed into a primary coil which is capacitively loaded‚ the coil will ’ring’‚ and form an oscillating magnetic field. The energy will transfer back and forth between the magnetic field in the inductor and the electric field across the capacitor at the resonant frequency. This oscillation will die away at a rate determined by the Q factor‚ mainly due to resistive and radiative losses. However‚ provided the secondary coil cuts enough of the field that it absorbs more energy
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Chapter I I. Introduction Power electronics converters can be found wherever there is a need to change voltage‚ current of frequency of electric power. The power range of these converters is forming some mill watts (as in mobile phone) to thousands of megawatts in an HVDC transmission system. With classical electronics‚ electrical currents‚ and voltage are used to carry information‚ where as with power electronics‚ they carry power electronics becomes the efficiency An inverter converts DC
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electricity. Experiment Apparatus Professor Faraday Michael Faraday’s Experiment (the induction ring) * When he passed an electric current through one coil he induced an electric current in the other coil‚ which flowed for a very brief period of time. * Making the induction ring was a tedious process since Faraday had to wind the coils of wire on opposite sides of the ring and insulate them with cotton. * main discoveries include those of electromagnetic induction‚ diamagnetism and
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