Common uses of magnets Hard disks record data on a thin magnetic coating. • Magnetic recording media: VHS tapes contain a reel of magnetic tape. The information that makes up the video and sound is encoded on the magnetic coating on the tape. Common audio cassettes also rely on magnetic tape. Similarly‚ in computers‚ floppy disks and hard disks record data on a thin magnetic coating. • Credit‚ debit‚ and ATM cards: All of these cards have a magnetic strip on one side. This strip encodes
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Living Science (Second Edition) Unit Test 2 8ʳ Making use of electricity S2 Science Test Unit 8ġ Making use of electricity Name:____________________________ ΰʳ ʳ ʳ α Time and Marks Class: ____________________________ Part A: 35 min / 100 marks Date: ____________________________ Parts A & B: 45 min / 120 marks Note: ʳ 1 Attempt ALL questions. 2 Write your answers in the spaces provided on the Answer Sheets. ʳ Part A (Level 1) A True or false questions (5 marks‚ 1 mark each) Study
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Lab Electric Fields Introduction: This experiment was to investigate the concept of the electric field‚ and to determine the shape of equal potential lines surrounding charged objects. 1. Procedures: Place the sheet of graph paper on a table and center the clear dish over the grid. 2. Prepare the conductors by first making 2 longer jumper cables from 4 short ones. Do this by simply opening the
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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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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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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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What’s the difference between resistance and resistivity? Resistance is the obstruction offered to the flow of current by a conductor. Resistivity is the obstruction offered to the flow of current by UNIT AREA OF the conductor. So basically‚ resistance is the property of the object (say a copper wire)‚ whereas resistivity is the property of the substance (copper). And so resistance depends upon the properties of the object. Whereas resistivity depends upon the properties of the metal.
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