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# ENGE 211 Week 2 Notes ENGE 211

LU

GPA 3.6

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This 6 page Class Notes was uploaded by Madison Notetaker on Monday September 12, 2016. The Class Notes belongs to ENGE 211 at Liberty University taught by Dr. Bae in Fall 2016. Since its upload, it has received 7 views. For similar materials see Intro to Electrical Circuits in Electrical Engineering at Liberty University.

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Date Created: 09/12/16

ENGE 211 Book Notes 1.3 charge-an electrical property of the atomic particles of which matter consists, measured in Coulombs (C) the motion of charges causes electric current electric current – the time rate of change of charge, measured in Amperes (A) (1 A= 1C/sec) voltage – (potential difference) the energy required to move a unit charge from a reference point (-) to another point (+) Anacronym: (B)ad (B)oys (R)un (O)ver (Y)oung (G)rass (B)ut (V)iolets (G)row (W)ildly 2.1 Ohm’s law states that the voltage v across a resistor is directly proportional to the current i flowing through the resistor. V=IR short circuit; a circuit element with resistance approaching zero Open circuit = a circuit element with resistance approaching infinity Resistors are either fixed or variable Conductance= a measure of how well an element will conduct electric circuit o Unit= mho (ohm backwards) 2+ elements are in series if they exclusively share a single node and carry the same current 2+ elements are in parallel if connected to the same two nodes and have the same voltage across them if current flows from lower potential to higher potential, v=-iR o short circuit - an element with R=0 o open circuit – an element with R= infinity o potentiometer – a three-terminal element with a sliding contact or wiper slope of a graph =R ENGE 211 Book Notes conductance =G, the ability of an element to conduct electric current, measured in mhos or siemens power = p=vi = i^2R = v^2/R; i^2/G 2.3 branch – represents a single element such as a voltage source or a resistor; any two-terminal element node – the point of connection between 2+ branches; usually indicated by a dot in a circuit loop – any closed path in a circuit; starting at a node, passing through a set of nodes, and returning to the starting node 2.4 Kirchhoff’s current law – states that the algebraic sum of currents entering a node (or a closed boundary) is zero Kirchhoff’s voltage law – states that the algebraic sum of all voltages around a closed path (or loop) is zero Reading Assignment Answers: 1. Insulators have high resistivities. 2. Symbol for resistor 3. When Ohm’s law is applied to a circuit, current decreases with increase in resistance. 4. For v=iR, the current should flow from a higher potential to a lower potential 5. In practice, a short circuit is usually a connecting wire assumed to be a perfect conductor. 6. A circuit with R= infinity is known as an open circuit. 7. Image of a wirewound resistor 8. I ohm = 1V/1A 9. The i-v graph is that of a linear resistor 10. 100 ohm= .01 S 11. what is the relationship between power (P), current, (I), and conductance (G)? p=i^2/G 12. Identify the nodes in the circuit: point a, point b, and point c 13. A loop is any closed path in a circuit 14. Elements are in series when they are chain-connected sequentially, end-to-end 15. As per passive sign convention, if current flows from a lower potential to a higher potential, v=iR. FALSE 16. The circuit symbol in the figure is used to denote a fixed resistor 17. What is the reciprocal of resistance? Conductance ENGE 211 Book Notes 18. A resistor is connected in a circuit. If the resistor’s conductance is 0.1 S and the voltage across the resistor is 10 v, what is the power dissipated by the resistor? 1W; p=v^2/R 19. What are the different formulas used to determine the power dissipated by a resistor a. P=v^2/R given v=voltage and r=resistance b. P=i^2R given i=current and r=resistance c. P=vi given v=volrage and i=current 20. What is the accurate relationship between power p, current, and electric conductance G? p=i^2/G 21. A voltmeter measures the voltage across a load 22. Kirchoff’s current law states that the algebraic sum of currents entering a node (or a closed boundary . 23. The total current entering the closed surface is equal to the total current leaving the surface. 24. Kirchhoff’s second law is based on the principle of conservation of energy. 25. The sum of voltage drops=the sum of voltage rises. 26. Kirchhoff’s voltage law states that the algebraic sum of all voltages around a closed path (or loop) is 0. 27. A voltmeter measures the voltage across a load 28. Wye and delta networks are used in: electrical filters, three-phase networks, matching networks 29. V=80 V, R=4, i=20A 30. I(Rn+Rm)=V 31. *matching 32. Items where resistors are used: oven, electric stove, light 33. *matching 34. G1=.1, G2=.1S, V=10 V, i-? 2A 35. A wye-connected network 36. A potentiometer – is used as a volume or level control on radios, TVs and other devices and it is a three-terminal device that operates on the principle of voltage division 37. A series connection is seldom used in lighting systems because: it is hard to maintain and when a lamp fails out, all the lamps go out 38. V=i(r1+R2) 39. 5 V, 45 W = 9A

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