The word electric itself comes from the Greek word elektron for amber, because the ancient Greeks noticed that amber, when rubbed by fur, attracts dry straw. It took scientists a long time to discover what lay behind these two types of charges. Ask which type of force is at work between the balloon and the glass rod or comb (a repulsive force). Amuse the students by pushing the balloon first in one direction and then quickly moving the glass rod or comb to the opposite side of the balloon to make it decelerate and then move in the opposite direction. Place the balloon on a nonconducting tabletop, and use the glass rod or comb to repel the balloon and make it roll across the tabletop. A simple demonstration may be to charge a glass rod or comb by rubbing it with wool, silk, or other cloth and then charge an inflated balloon by rubbing it on your shirt or hair. Prepare a demonstration of static electricity. Figure 18.2 shows how these simple materials can be used to explore the nature of the force between charges. Similarly, two silk cloths rubbed in this manner will repel each other, because both cloths have negative charge. Two glass rods rubbed with silk in this manner will repel one another, because each rod has positive charge on it. Because the glass and silk have opposite charges, they attract one another like clothes that have rubbed together in a dryer. For example, when glass is rubbed with silk, the glass becomes positively charged and the silk negatively charged. By convention, we call one type of charge positive and the other type negative. How do we know there are two types of electric charge? When various materials are rubbed together in controlled ways, certain combinations of materials always result in a net charge of one type on one material and a net charge of the opposite type on the other material. A positive charge and a negative charge attract each other. Thus, two positive charges repel each other, as do two negative charges. Like charges repel each other, and unlike charges attract each other. Electric charge comes in two varieties, which we call positive and negative. This saying is based on electric charge, which is a property of matter that causes objects to attract or repel each other. Lecture: 3 Lab: 0 Tutorial: 0.You may know someone who has an electric personality, which usually means that other people are attracted to this person.
SOLVE ELEC TUTORIAL HOW TO
Students will learn how to find certain kinds of paths through graphs (Euler circuits) and will see how such paths can be used to solve an analog-to-digital conversion problem. An introduction to graph theory (which can be used to represent the relationship between discrete objects) will be given. It will be shown how results from partial orders can be used to do computer job scheduling. Students will then learn about relations, including equivalence relations and partial orders. These techniques in combinations and permutations are then applied to some problems in error-detection and error-correcting codes. Much of the course is then focused on counting, in particular learning tools for counting large groups of discrete objects and for determining the probability of discrete events occurring. With numbers and logic as underpinnings, students will then learn proof techniques such as induction. Students will learn how to apply formal logic to determine if an argument is valid and will also indirectly use logic in proofs throughout the course.
The course then moves to basic propositional logic. The course starts with the study of integer numbers and using techniques for manipulating numbers we learn how real-world problems such as RSA encryption can be solved. This course looks at modeling and solving problems that involve discrete objects.
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