Introduction to Materials Science and Engineering Chapter 1. Introduction Hyung-Joon Shin School of Mechanical and Advanced Materials Engineering Ulsan National Institute of Science and Technology (UNIST) UNIST 2011 Spring AME20201 Introduction • Course Objective: Introduce fundamental concepts in Materials Science • You will learn about: • material structure • how structure dictates properties • how processing can change structure the final grade. Please actively take part in the class
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the equivalent resistance is increased? (1 Mark) (Ans) The resistances should be connected in series so that the equivalent resistance is increased. 8. The length of the wire is doubled‚ what is the change in its resistivity? (1 Mark) (Ans) There is no change in the resistivity since it only depends upon the type of material used. 9. The combination of resistances shown below has equivalent resistance equal to 12 ohm‚ what is the value of R? (1 Mark) (Ans) Resistances are connected
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Magnetic effect of electric current is one of the major effects of electric current in use‚ without the applications of which we cannot have motors in the existing world. A current carrying conductor creates a magnetic field around it‚ which can be comprehended by using magnetic lines of force or magnetic field lines. The nature of the magnetic field lines around a straight current carrying conductor is concentric circles with centre at the axis of the conductor. The direction of the magnetic field
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terrain level‚ there are two paths from source to receiver‚ the direct path and the reflected path from ground. Nord2000 takes into account the signal phase of the two paths as waves reflected from ground have a phase shifting depending on the flow resistivity. ISO 9613 deals with ground reflection in an averaged way. So‚ Nord2000 is more successful than ISO 9613 in this
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to check the resistance from the graph see what is plotted along the x and y axis. Reason why alloys are used to make elements of electric irons and heaters is not because they are insulators. 2. Units 3. 4. Formula Graphs 5. Resistivity 6. Change in resistance If a wire is folded(doubled on it) and made half its length‚ then the resistance does not become half. 7. Resistors in series Is the current or the voltage same in resistors in series. How to avoid The
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Blackbody radiation: a spectroscopic study John Greavu Partner: Nicholas Souhleris TA: Yilikal Ayino (Friday‚ Section 006) April 18‚ 2014 I. PRELAB A blackbody is a body that absorbs all electromagnetic radiation and emits a continuous spectrum‚ such as heated cavern with just a small opening to the outside world. In 1900‚ German physicist Max Planck derived an expression for this blackbody spectrum. Knowing that oscillators emit radiation‚ he assumed that oscillators within the cavern were
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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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Electrical Conductance and Insulation OVERVIEW: Every thing in the world is differentiable on the basis of its electrical conductance. Some things are called insulators and these substances never conduct electricity. they include things such as cold air‚wood and plastic. Then there are things that conduct electricity and current flows through them‚ they are called conductors. examples of conductors are most metals like copper and steel. Other materials that are sometimes used as conductors are
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Section B: Essay type questions. Answer ANY THREE Questions. 1) (a) Define the terms: (i) Resistivity (ii) Temperature Coefficient of Resistance (4mks) (b) Name THREE factors which affect the resistance of a metallic conductor. (3mks) (c) A copper cable 1500 m long‚ has a cross-sectional area of 25 x 10-6 m2 at 20ºC. The resistivity of copper is 1.7 x 10-8 Ωm. Calculate the (i) resistance of the cable (R=ρl/A) (4mks) (ii) resistance
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RESUME Rishi Mohan Srivastav Permanent Address- Phone: 08765037503 Raja Dhaba Jolhupur Moan E-mail: rishidesire.srivastav8@gmail.com Kalpi Distt. Jalaun rishi.srivas1@gmail.com UP‚ India
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