Answer key for electronic principles by albert malvino

Chapter 1
1. An ideal voltage source has a. Zero internal resistance b. Infinite internal resistance c. A load-dependent voltage d. A load-dependent current 2. A real voltage source has a. Zero internal resistance b. Infinite internal resistance c. A small internal resistance d. A large internal resistance 3. If a load resistance is 1 kohm, a stiff voltage source has a resistance of a. At least10 ohm b. Less than 10 ohm c. More than 100 kohm d. Less than 100 kohm 4. An ideal current source has a. Zero internal resistance b. Infinite internal resistance c. A load-dependent voltage d. A load-dependent current 5. A real current source has a. Zero internal resistance b. Infinite internal resistance c. A small internal resistance d. A large internal resistance 6. If a load resistance is 1kohm, a stiff current source has a resistance of a. At least 10 ohm b. Less than 10 ohm c. More than 100 kohm d. Less than 100 kohm 7. The Thevenin voltage is the same as the a. Shorted-load voltage b. Open-load voltage c. Ideal source voltage d. Norton voltage 8. The Thevenin resistance is equal in value to the a. Load resistance b. Half the load resistance c. Internal resistance of a Nortoncircuit d. Open-load resistance

9. To get the Thevenin voltage, you have to a. Short the load resistor b. Open the load resistor c. Short the voltage source d. Open the voltage source 10. To get the Norton current, you have to a. Short the load resistor b. Open the load resistor c. Short the voltage source d. Open the current source 11. The Norton current is sometimes called the a. Shorted-loadcurrent b. Open-load current c. Thevenin current d. Thevenin voltage 12. A solder bridge a. may produce a short b. may cause an open c. is useful in some circuits d. always has high resistance 13. A cold-solder joint a. shows good soldering technique b. usually produces an open c. is sometimes useful

d. always has low resistance 14. An open resistor has a. Infinite current through it b. Zerovoltage across it c. Infinite voltage across it d. Zero current through it 15. A shorted resistor has a. Infinite current through it b. Zero voltage across it c. Infinite voltage across it d. Zero current through it 16. An ideal voltage source and an internal resistance is an example of the a. Ideal approximation b. Second approximation c. Higher approximation d. Exact model 17. Treating a connectingwire as a conductor with zero resistance is an example of the a. Ideal approximation b. Second approximation c. Higher approximation d. Exact model

18. The voltage out of an ideal voltage source a. Is zero b. Is constant c. Depends on the value of load resistance d. Depends on the internal resistance 19. The current out of an ideal current source a. Is zero b. Is constant c. Depends on the valueof load resistance d. Depends on the internal resistance 20. Thevenin’s theorem replaces a complicated circuit facing a load by an a. Ideal voltage source and parallel resistor b. Ideal current source and parallel resistor c. Ideal voltage source and series resistor d. Ideal current source and series resistor 21. Norton’s theorem replaces a complicated circuit facing a load by an a. Ideal voltagesource and parallel resistor b. Ideal current source and parallel resistor c. Ideal voltage source and series resistor d. Ideal current source and series resistor

22. One way to short a device is a. With a cold-solder joint b. With a solder bridge c. By disconnecting it d. By opening it 23. Derivations are a. Discoveries b. Inventions c. Produced by mathematics d. Always called theorems 24.Laws are proved by a. Definition b. Experiment c. Mathematics d. Formulas 25. Definitions are a. Man made b. Invented c. Made up d. All of the above

Chapter 2
1. The nucleus of a copper atom contains how many protons? a. 1 b. 4 c. 18 d. 29 2. The net charge of a neutral copper atom is a. 0 b. +1 c. -1 d. +4 3. Assume the valence electron is removed from a copper atom. The net charge of the...