Liquid Crystals

IV. GENERALIZATION: Situational Analysis ******* ###### ⠀⠀⠀⠀⠀⠀ |||||||||||| ⠀⠀⠀⠀⠀⠀ 1.11 m. High rise buildings usually have a lightning rod system to protect the infrastructure from lightning. Using the topic discussed, give a simple explanation of how lightning rods protect buildings.

A:17 A exam.ptuk.edu.ps على فيزياء عامه 2 نظري طولكرم Question 21 Not yet answered Marked out of 2.00 P Flag question A wire of variable cross-section is given below. The relation between the drift speeds on the two cross-sections 1 and 2 is Select one: a. V12=2Vd1 b. 9V42=Vd1 c. Va2=Va1 d. 3V42=2Vd1 e. 3V12=Vd1 Previous page Next page الامتحان النصفي Jump to... Return to: General )

A. Explain how lightning is produced and the mechanism of lightning rods.   B. True or False 1. Time constant is equal to R / C. 2. A good ammeter is designed with a VERY SMALL equivalent resistance to avoid reduction of current when connected in a circuit.

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6. For the RC circuit shown, determine the charge on the plates of the capacitor after 40 x 10-3seconds, if R = 20 2, C=1x 10-3F, and e = 3000 volts. Assume the capacitor is charging. C 1.92 b. 2,59 c. 2.74 d. 2.81 none of the above a. e.

1. Why is an electromotive force not a “force”? Justify your answer.   2. Are electromotive force and voltage the same? Justify your answer.   3. A battery contains an emf of 20.0 V. Determine the current flowing the circuit once it is connected to a 30.50 Ω load if the internal resistance of the emf is equal to 0.234 Ω.   4. A battery has an emf of 12V. When a load resistance of 4 Ω is connected to the battery terminals; a current of 2 amperes flows through it. Calculate the internal resistance of this battery. NOTE: Derive the formula of emf to get the internal resistance.

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5. Consider the following circuit: What is the current flowing through R5? Given that R1 50, R2 = 32, R3 = 42, R4 = 12, R5 = 20 R1 R3 R2 12V R4 R5

Directions: Write the letter of the correct answer. _1. What type of energy transformation is involved in an electric motor? A. mechanical to chemical C. electrical to mechanical D. chemical to mechanical B. mechanical to electrical _2. What type of energy conversion is involved in an electric generator? A. mechanical to chemical C. electrical to mechanical D. chemical to mechanical B. mechanical to electrical _3. What basic principles enable generators to operate? A. Iron is the only element that is magnetic. B. Opposite electric charges attract and like charges repel. C. A current-carrying wire placed within a magnetic field will experience a magnetic force. D. A closed- loop conductor within a changing magnetic field will have an induced voltage. _4. What transformation can take place in a ceiling fan's electric motor? A. Alternating current into direct current B. Direct current into alternating current C. Mechanical energy into electrical energy D. Electrical energy into mechanical…

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1. What equation do you get when you apply the loop rule to the loop abcdefgha, in terms of the variables in the figure?  2. If the current through the top branch is I2 = 0.41 A, what is the current through the bottom, I3, in amps?

9. Consider a wire with two sections of different diameters. a) Is I1 less than, greater than, or equal to I2? • A. I 2 • C. I1 = 12 b) Is J1 less than, greater than, or equal to J2? • A. Jj J2 • C. Jį = J2 c) Is Ej less than, greater than, or equal to E2? . А. Ej Е2 • C. Ej = E2 d) Is va,1 less than, greater than, or equal to va,2? . А. Va,1 Vd,2 • C. vd,1 = Vd,2

A wire of variable cross-section is given below. The relation between the drift speeds on the two cross-sections 1 and 2 is 3a Select one: a. 3V42-2Vd1 b. 3V-Va d2 d1 C. 9V2-V1 O d. V=2V e. V-Vd1 OS Shot by Hisense H12

Kenny's father bought him two cables that he can use for his project: a 200 cm cable, and a 50 cm cable. Kenny wants as little resistance in his circuit as possible. If both cables are made with the same conductor material, then which cable should he use?   A. The 200 cm cable, because the longer a circuit is, the less resistance it has B. The 50 cm cable, because the longer a circuit is, the more resistance it has C. Either the 50 cm cable or the 200 cm cable, because they have the same resistance D. Neither the 50 cm cable nor the 200 cm cable, because both of them have a resistance

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