Modern Commercial Wiring, 8th Edition Page 19 (35 of 324)

Chapter 1 Electrical Fundamentals Review 19 Copyright Goodheart-Willcox Co., Inc. Copyright Goodheart-Willcox Co., Inc. Use the following circuit for Questions 21–25. 12 V R1 = 5 Ω R2 = 15 Ω R3 = 20 Ω 21. What is the total resistance in the circuit? A. 10 Ω B. 25 Ω C. 40 Ω D. 55 Ω 22. What is the total current in the circuit? A. 0.4 A B. 1.2 A C. 2.8 A D. 3.0 A 23. What is the voltage at R 1 ? A. 1 V B. 3 V C. 6 V D. 12 V 24. What is the voltage at R 2 ? A. 2.5 V B. 9 V C. 12 V D. 21 V 25. What is the voltage at R 3 ? A. 1 V B. 3 V C. 6 V D. 12 V 26. If the true power in the following circuit is 0.875, what is the reading on the wattmeter? 14 A 240 V V W A M A. 434 W B. 872 W C. 1365 W D. 2940 W Apply and Analyze 1. Explain the difference between an insulator and a conductor. 2. Briefl y explain instantaneous, peak, and effective voltages. 3. What is nominal voltage? 4. What is the phase relationship of a purely resistive ac circuit?

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Chapter 1 Electrical Fundamentals Review 19 Copyright Goodheart-Willcox Co., Inc. Copyright Goodheart-Willcox Co., Inc. Use the following circuit for Questions 21–25. 12 V R1 = 5 Ω R2 = 15 Ω R3 = 20 Ω 21. What is the total resistance in the circuit? A. 10 Ω B. 25 Ω C. 40 Ω D. 55 Ω 22. What is the total current in the circuit? A. 0.4 A B. 1.2 A C. 2.8 A D. 3.0 A 23. What is the voltage at R 1 ? A. 1 V B. 3 V C. 6 V D. 12 V 24. What is the voltage at R 2 ? A. 2.5 V B. 9 V C. 12 V D. 21 V 25. What is the voltage at R 3 ? A. 1 V B. 3 V C. 6 V D. 12 V 26. If the true power in the following circuit is 0.875, what is the reading on the wattmeter? 14 A 240 V V W A M A. 434 W B. 872 W C. 1365 W D. 2940 W Apply and Analyze 1. Explain the difference between an insulator and a conductor. 2. Briefl y explain instantaneous, peak, and effective voltages. 3. What is nominal voltage? 4. What is the phase relationship of a purely resistive ac circuit?

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18 Modern Commercial Wiring Copyright Goodheart-Willcox Co., Inc. 18 Modern Commercial Wiring Copyright Goodheart-Willcox Co., Inc. Use the following circuit for Questions 12–16. 120 V Source R1 = 10 Ω R3 = 20 Ω R4 = 35 Ω R2 = 25 Ω 12. What is the voltage at R 1 ? A. 13.3 V B. 24.8 V C. 58.2 V D. 65.25 V 13. What is the voltage at R 2 ? A. 12.8 V B. 33.25 V C. 48.65 V D. 82.5 V 14. What is the voltage at R 3 ? A. 10.2 V B. 16.75 V C. 26.67 V D. 32.82 V 15. What is the voltage at R 4 ? A. 14.67 V B. 23.91 V C. 46.67 V D. 63.16 V 16. What is the total current in the circuit? A. 0.67 A B. 1.33 A C. 2.75 A D. 3.33 A Use the following circuit for Questions 17–20. 120 V Source R1 = 20 Ω R2 = 40 Ω 17. What is the current at R 1 ? A. 2 A B. 3 A C. 6 A D. 9 A 18. What is the current at R 2 ? A. 2 A B. 3 A C. 6 A D. 9 A 19. What is the total current in the circuit? A. 2 A B. 3 A C. 6 A D. 9 A 20. What is the total resistance in the circuit? A. 7.2 Ω B. 9.5 Ω C. 11.6 Ω D. 13.3 Ω

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20 Modern Commercial Wiring Copyright Goodheart-Willcox Co., Inc. 20 Modern Commercial Wiring Copyright Goodheart-Willcox Co., Inc. 5. In the following circuit, determine the total resistance, total circuit current, and voltage across each resistor. 9 V R1 = 8 Ω R3 = 20 Ω R4 = 52 Ω R2 = 16 Ω 6. The total current in this circuit is 4 amps. Determine the resistance of R 5 . 24 V R1 = 4 Ω R3 = 8 Ω R2 = 4 Ω IT = 4 A R4 = 10 Ω R5 = ? 7. In the following circuit, determine the total resistance, total circuit current, and voltage across each resistor. R2 = 2 Ω R4 = 5 Ω R1 = 1 Ω R5 = 3 Ω R6 = 40 Ω R3 = 3 Ω 120 V Critical Thinking 1. Explain electromagnetic induction in your own words. Give an example of a case where electromagnetic induction would generate an electric current. 2. How would you create a circuit with multiple bulbs if you wanted to be sure that if one bulb burns out, the remaining bulbs remain lit?

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