systems 1. Dynamo This was the type of electrical generator used on older vehicles. It consisted of a rotating conductor inside a fixed magnetic field. Rectification of the A.C. current to D.C. was by means of a commuter. Output of the dynamo was limited due to the rotating speed of the conductor 2. Alternator In the alternator the magnetic field rotates‚ while the conductor is stationary. This allows the alternator to operate at higher speeds than the dynamo‚ giving greater output. Generating
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Kevin Williams Project 1 The use of electricity and magnetism in transportation When Benjamin Franklin discovered electricity‚ it was probably one of the biggest discoveries known to mankind. Even though our dependence of electricity is a lot‚ however at the same time it’s easy to forget how dependent we actually are on it. Electricity always has and always will play a huge part in our everyday life. It’s hard to imagine humanity without it. When it comes to transportation‚ it is going to rewrite
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Mechanics 5. Magnetic compass 6. (Tape notes in notebook) Some things attract‚ others repel. All objects fall and move with respect to gravity. 7. Benjamin Franklin 8.A fundamental element of mass 9. Like repel‚ different attract 10. far apart- hard to tell they are attracting‚ close together-easy to notice. 11. They both have like currents and likes repel‚ opposites attract but magnets have poles not charges. They are still positive and negative. 12. In one direction there I am electric field and in another
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runs through a set of coils and creates a magnetic field that actuates an arm inside and closes the circuit. Relays are used as switches to control larger circuits with more power. Since a relay is able to control an output circuit of higher power than the input circuit‚ it can be considered to be a form of an electrical amplifier. When using a relay in a dc current‚ diodes are put in across the coil to dissipate energy from the collapsing magnetic field at deactivation‚ which would cause a spike
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Universe and Inverse are closely related‚ for the effects of known forces of universe are inverse in nature. Ever since Newton made a bold proposition that there is a force of attraction amongst the planets of planetary system‚ amongst different planetary systems and amongst the different galaxies and varies as Inverse Square of their distances‚ people began to correlate every activities of nature and predict its effect accurately. 1. Kepler’s laws Tycho Brahe’s largest and most accurate collections
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of their energy to one or other of the bulbs. Both bulbs obtain the full 1.5V potential difference of the battery‚ they are each normally bright. The effects of an electric current An electric current can cause 1. a heating effect 2. a magnetic effect 3. a chemical effect Measurement of electric current Electric current flowing through a component is measured in ampère‚ A‚ using an ammeter which is connected in series with the component. Electric current in a series
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NATIONAL SENIOR CERTIFICATE EXAMINATION NOVEMBER 2008 PHYSICAL SCIENCES: PAPER I Time: 3 hours PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY 1. This paper consists of: • a question paper of 17 pages • a data and formula booklet of 3 pages (i – iii) Please make sure that your question paper is complete. 2. 3. 4. 5. 6. Remove the pages of data and formulae from the middle of this question paper. Use the data and formulae whenever necessary. Read the questions carefully. In Question 1 answer 1
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70 70 70 70 70 50 50 520 Total Marks 100 100 100 100 100 100 100 100 800 B.E. 4th Semester B.E. 2nd Year 2nd Semester Code No. EEM 221 ECE 222 ECE 223 ECE 224 ECE 225 ECE 226 ECE 227 ECE 228 ECE 229 Subject Mathematics – IV Electromagnetic Field Theory & Transmission Lines Analog Electronic Circuits Probability Theory & Random Process Signals and Systems Advanced
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Basic Electronics Chapter 2 Basic Electrical Principles and the Functions of Components Figures in this course book are reproduced with the permission of the American Radio Relay League. This booklet was compiled by John P. Cross AB5OX PHYS 401 Physics of Ham Radio 25 Basic Electrical Principles • Conductors - keep loose grip on their electrons and allow electrons to move freely. Metals are usually good conductors. • Insulators - keep close hold of their electrons and do not
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of magnetic material. Pic of ideal transformer The two windings have no conductive connection between them and are kept separate‚ usually by the length of the yoke and also by insulation around the conductive material. In other words they are not linked electrically but they are linked magnetically. On the input side of the transformer (primary winding) a varying electrical current is applied. This varying current produces magnetic flux that flows around the core. This varying magnetic flux
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