Week5Lecture Physics

Week5Lecture Physics - Week 5: Complete Circuits, Faraday's...

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Week 5: Complete Circuits, Faraday's Law Inductance Capacitance - Lecture Help Week 5 TCOs 9, 10 Complete Circuits Faraday's Law Inductance Capacitance Chapter 20: Electromagnetic Induction Sections: 20.1, 20.3, 20.6, 20.9 Chapter 21: Alternating Current Sections: 21.1, 21.3, 21.4 Lab 5 Report: Virtual Circuits Graded Discussion Topics Quiz Print This Page Electric Circuits The Electromagnetic Force | Capacitors and Electric Fields | Energy Stored in a Capacitor | Voltage (emf) and Circuits | Resistance and Resistivity | Series and Parallel Circuits | Electric Generators | Faraday's Law | Transformers Thomas Edison is well known as the inventor of the light bulb. What is less well known is his battle with his rival, Nikola Tesla, over the means for delivering electrical power to those light bulbs. Thomas Edison was a big fan of direct current (DC). Why? direct current is supplied by batteries, and it is very simple to work with. Direct current did not require advanced mathematics or calculus to work with. In fact, Edison is said to have referred to Alternating Current (AC) as "the devil's currents". In spite of its simplicity, direct current is difficult to distribute. It is not easy to convert voltage levels, nor to transmit for very long distances without significant power losses. Nikola Tesla saw the benefits of alternating current. In contrast to direct current, AC voltages could be converted very easily using transformers. Furthermore, AC power transmission could be done with very little power loss. In this module we will take a closer look at the behavior of electricity in circuits, and gain a better understanding of why Nikola Tesla was right and why today we have AC power in our power outlets. The Electromagnetic Force
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Every force in the universe falls into one of four categories, electromagnetic, gravitational, strong, and weak. We have examined in depth what happens to objects in gravitational fields. They fall with a constant acceleration of 9.8 m/s^2. When an object is not in free fall, but is experiencing acceleration due to gravity on an inclined plane, the force of friction applies. Friction is a force related to the interaction of the large number of atoms on each surface. In this module we will examine the force that binds electrons to nuclei. This force is called the electromagnetic force. Although electrons are bound to the atomic nuclei, the electrons in the outer shell of atoms are also attracted to nuclei of other nearby atoms. This attraction is what causes atoms to group together and form solids and liquids. The electromagnetic force has two major components. As we have learned in the previous week, the electromagnetic force exhibits two major forms: electric and magnetic fields. Capacitors and Electric Fields
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This note was uploaded on 03/09/2011 for the course PHYS 270 taught by Professor Danielhale during the Spring '11 term at DeVry Chicago.

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Week5Lecture Physics - Week 5: Complete Circuits, Faraday's...

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