Transformer What is a Transformer? A transformer is made from two coils‚ one on each side of a soft iron core. It can decrease the voltage (called a step down transformer). or increase the voltage (called a step up transformer‚ shown below). Alternating current is passed through the primary coil (the input) which creates a changing magnetic field in the iron core. The changing magnetic field then induces alternating current of the same frequency in the secondary coil (the output).
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Self-induction To understand tuned circuits‚ we first have to understand the phenomenon of self-induction. And to understand this‚ we need to know about induction.The first discovery about the interaction between electric current and magnetism was the realization that an electric current created a magnetic field around the conductor. It was then discovered that this effect could be enhanced greatly by winding the conductor into a coil. The effect proved to be two-way: If a conductor‚ maybe in the
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Year 11 Preliminary Assignment #2 – Physics Electricity in the Home Aim: Will the current (Amps) affect the time it takes for a slot car to complete a lap of the track? Planning the investigation: 1. What do you know about the topic from personal experience? From playing with slot cars and building tracks even before I embarked on the physics course‚ I’d always realised the relationship between the trigger and the speed of the cars. In the investigation‚ I hope to use a more scientific method
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Duracell Power-Mat ABSTRACT In the future we vision the Duracell Power-Mat being able to charge more devices at a time and even at a greater distance. With the advancement in technology it may not take long before this is achieved. We can see our idea being used in homes‚ offices‚ cars‚ coffee shops‚ and even grocery stores while you are waiting at the checkout lane. INSERT PROJECT TITLE PRESENT TECHNOLOGY The Power mat transfers electrical power using a magnetic field which is generated
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C H A P T E R Learning Objectives ➣ Relation Between Magnetism and Electricity ➣ Production of Induced E.M.F. and Current ➣ Faraday’s Laws of Electromagnetic Induction ➣ Direction of Induced E.M.F. and Current ➣ Lenz’s Law ➣ Induced E.M.F. ➣ Dynamically-induced E.M.F. ➣ Statically-induced E.M.F. ➣ Self-Inductance ➣ Coefficient of Self-Inductance (L ) ➣ Mutual Inductance ➣ Coefficient of Mutual Inductance ( M ) ➣ Coefficient of Coupling ➣ Inductances in Series ➣ Inductances in Parallel 7
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Week Five Textbook Exercises Geoffrey Anderson PHY/101 December 9‚ 2014 Mr. Craig Spencer Week Five Textbook Exercises Chapter 22: Electrostatics 8) When combing your hair‚ you scuff electrons from your hair onto the comb. Is your hair then positively or negatively charged? How about the comb? -The hair becomes positively charged and the comb becomes negatively charged; since‚ the electrons went from your hair to the comb and the more electrons there is makes an object more negative. 18)
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FHFHGFKYITJ;LKJHGFKFDLKJDSLKJHGFD.JKHGFDDRFRYRHFYHFDGCVGDVXVBVGDVMotivation 3.2 Nodal analysis. 3.3 Nodal analysis with voltage sources. 3.4 Mesh analysis. 3.5 Mesh analysis with current sources. 3.6 Nodal and mesh analysis by inspection. 3.7 Nodal versus mesh analysis. Circuit Analysis I 2 3.1 Motivation (1) If you are given the following circuit‚ how can we determine (1) the voltage across each resistor‚ (2) current through each resistor. (3) power generated by each current source‚ etc
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Data Analysis Is a magnet affect by warm or cold temperatures? This experiment showed that if a magnet is cold‚ then it will have more magnetic pull than a warm magnet. The independent variable is the temperature of magnets. The dependent variable is the magnetic pull of magnets. The experimental group is magnets exposed to different temperatures. The control group is the room temperature magnet. The control variables are the amount of time the magnets are exposed to different temperatures‚ the
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The Charging System The charging system provides the electrical energy required by the various electrical systems and also keeps the battery charged. Types of charging 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
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2.1 Motors use the effect of forces on current-carrying conductors in magnetic fields 2.1.1 The motor effect The motor effect is where a force acts on a current-carrying conductor in a magnetic field. The right hand palm rule is used to find certain properties: fingers point to magnetic field‚ thumb points in DC direction and palm points to direction of the force. 2.1.2 Factors affecting the force acting on the current-carrying conductor Forces are experienced by the electrons in the conductor
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