77. If electric power is transmitted over long distances, the resistance of the wires becomes significant. Why? Which method of transmission would result in less energy wasted-high current and low voltage or low current and high voltage? Explain your answer.
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- 0. An electric power station is producing 1.40 x 10 W of power that is to be sen o* town located 60.0 km away. Each of the two wires that comprise the trannion e resistance per kilometer of length of 400 x 10 Olpe/km. Find the power lont in beatin the wires if the voltage is stepped up from 2200 V to 20000 V using an ideal tranlorr. a) 1.21 x 10 Watts b) 2.32 x 10 Watts c) 1.12 x 10 Watts d) 5.59 x 10 Watts e) 1.16 x 10 Watts nhilo L4.00 yu which have their tratish u o m I. What is the total resistance ! 0 hol 2. What is the total current? 3. What is the voltage drop at the 2 onm resistor? 4. What Is the Power provided by the battery? 5. What Is the power Consumed by the n resistor? iliomit ort abnu batassignment6.pptx (65.9 KB) supply. For the circuit shown in Fig. 2.2 calculate (a) the circuit resistance, (b) the circuit current, (c) the p.d. developed across each resistor, and (d) the power dissipated by the complete circuit. R, R2 Ra 330 2 I 1.5 k2 470 2 V2 V3 Fin 22 bome ort sc delete nun loc + backspace 8 6 4. R ento K pause M B
- 24. An electric circuit is consisted of a 8 ohm resistor and a 4 ohm resistor connected in series with a battery of potential difference 24 V. What is the ratio of powers dissipated in the resistors of 8 ohm and 4 ohm, P8 ohm⁄P4 ohm?A. 4 B. 16C. 2 D. 825. What is the total power dissipated in the electric circuit of question 24?A. 48 W B. 36 WC. 40 W D. 32 W2. An Iron wire at 0 Celcius has resistivity Ro. At which temperature the resistiv- ity of this wire will be 1.2Ro. You can find the value temperature coefficients of resistivity from Table 25.2 from your book. Explain the physical mechanism of rising resistivity by the rising temperature.what is the total resistance? Assume that the current enters one coraer and the sides of a cube. exits at the diagonally opposite corner. B. A cell with internal resistance of 1.0 o is connected in series withn5.0 oresistor and 3.0 N. The voltage across the 5 n resistor is 5 V. (al What current flows through the circuit? (b) What is the voltage across the 3 a resistor? iel What is the terminal voltage of the cell? (d) What is the emf of the cell? 9. There are 100 graduations In the scale of an ammeter with internal resistance of 0.18 n and intended to measure a current up to 10 A. (a) What is the value of each graduation? (b) Convert this to an ammeter that can measure up to 100 A. (c) How will the value of the graduations change? 10. There are 30 graduations in the scale of a voltmeter with an internal ading of 30 V.
- 12. A lightbulb uses 4 A when it is connected across a 120 V source. What is the resistance in the resistane = V Vano -301 210-3012 lightbulb? 13. What is work? the transfer of energy by a force object agit is Displaced acting on by vitve opergy which a body possesses 14. What is kinetic energy? tion 15. What is potential energy? energy that is waiting to be a 16. A boy pushes on a parked car with a force of 111 N. The car does not move. How much work does the boy do on the car? Explain your answer. Work : Owork becasue the car. didn't move 17. In the absence of air resistance, how would the acceleration of a 2.0 kg book and the acceleration of a 3.3 kg rock differ if the objects were dropped from the same height? 18. What are Newton's three laws of motion (summarize them)? ject will not Law I an Change unle torce is acted on gecond low, the force On un object is equal! mass & its accelertion 3 law, when 2 bu interact they apply Forces to each oth 19. If your weight is 777 N, how much…Choose the CORRECT answer for each item. 1.There are two wires, one is made of copper and the other one is silver. These two wires of the same length are made, one from each of the materials. Is it possible for each wire to have the same resistance? Yes, because the two wires have the same length. Yes, because copper and silver have the different resistivity. No, because the two wires have the same length. No, because copper and silver have the different resistivity. a. b. C. d. 2.A flashlight requires two 1.5-volt batteries for it to light. The current that flows through it is equivalent to 0.15 A. In an hour of operation, how much charge flows in the system? a. 520 C b. 540 C c. 560 C d. 580 C 3.A hair blower contains a heating element which has a resistance of 57 Q. This heating element is energized by a 220-V outlet. What is the current that flows in the heating element? a. 3.9 A b. 4.9 A c. 5.9 A d. 6.9 AAn 80-2 resistor and a 20-2 resistor are connected in parallel, and then this combination is connected in series with a 32- resistor and a 24-V battery. An ammeter to measure the current through the 80- 2, and a voltmeter to measure the potential difference across the 32 Q is needed. TOraw the cireit 2 K he total 1e meter astanco of the cire What is the difference -potential across the 32-Q resistor? Across the 80-2 resistor? = 5. What is a fuse and how does it protect a circuit or device to which it is connected? 6. Show using diagrams how using only 2 Q resistors the following resistances can be made: ( a) 0.5 Ω (b) 1 Ω, ( c )3 Ω; ( d ) 5 Ω. 7. Three wires in a circuit meet in a common point. The currents flowing in two of them are 2 A and 3 A respectively. What are the possible values of the current in the third wire? Explain your answer [drawings would help]. D koksch_b201pdt Show AN MacBook Air esc 288 10 F11 F12 %23 & 2 4. 6. 8 9 11 delete Q W R T Y tab ps lock S D G H J. 11 K L…
- A 20V battery is used to supply current to a 10k resistor. Assume the voltage drop across any wires used for connections is negligible. What is the power dissipated by the resistor? O a. 0.002W O b. 20W O C. 0.04W O d. 40WQ3: A static electrical device has 2000 turns uses 4000 mA from the supply connected to a laptop whichhas a power of 20 V, 1000 W. How can you find the amount of current used by the laptop? Identify suchstatic electrical device used and evaluate supply voltage taken by it. Which category does it belong basedon its ability to change voltage? Practical efficiency of such electrical device is less than 100 %. Justifywith reasons. What are possible ways to improve its efficiency?tòr: I. Multiple Choice. Write the letter of the correct answer on the space provided before the number. 1. The current in a wire A. depends only on the potential difference applied B. depends only on the resistance of the wire C. depends on both resistance and potential difference D: does not depend on resistance and potential difference 2. When a current I flows through a resistance R for time t, the electrical energy spent is given by_ A. IRt B. 12R C. IR²t D. 3. Which of the following statements does noi represent Ohm's law? A. current / potential difference = constant B. potential difference / current = constant C. potential difference = current x resistance D. current = resistance x potential difference 4. The resistance of an electric bulb drawing 1.2 A current at 6.0 V is A. 0.50 W 5. The charge on an electron is known to be 1.6 × 10¬19 C. In a circuit, the current flowing is 1 A. How many electrons will be flowing through the circuit in a second? B. 5.0 W C. 0.20 W D. 2.0 W A.…