VI www 5kQ V2 1 ΚΩ 15 V 10 V 4kQ V3 Figure 5.3 16) See Figure 5.3. Which one of the following KVL equations describes this circuit? A) +10 V-V1-V2-15 V-V3-0 C)-10 V-V1-V2+15 V-V3-0 17) See Figure 5.3. The total current I is A) +2.5 mA. B)-2.5 mA. drop 51 16) B) +10 V+V1+V2-15 V+V3=0 D) +10 V-V1-V2+15 V-V3=0 17) C) +500 μA. D) -500 μA. 18) See Figure 5.3. Which one of the following statements is TRUE if the 10 V battery is replaced by a 15 V battery? A) Both batteries will be damaged. C) Polarity of current I will reverse. B) Current I will increase by 50%. D) Current I will drop to zero. 23 Which of die 19) In double-subscript notation, the voltage Vab is the same as A) Va-V B) Va 18) 19) C) Va - Vb. D) Va+Vb- 20) 20) Which one statement is TRUE of resistors in a series circuit? A) Large-value resistors dissipate more power than small-value resistors. B) Small-value resistors dissipate more power than large-value resistors. C) The smallest resistor has the largest voltage drop. D) Each resistor dissipates the same power, regardless of its resistance value. 21) Which of the following laws states that the algebraic sum of voltages around a closed electrical circuit must equal zero? A) Faraday's voltage law C) Ohm's voltage law B) Coulomb's voltage law D) Kirchhoff's voltage law 21) 一 22) To measure voltage drops in a series circuit, a voltmeter should be connected in A) neither series nor parallel. C) series only. 23) The total resistance in a series circuit is A) dependent on the position of the voltage source. B) equal to the sum of the resistance levels. C) dependent on the number of current paths. D) equal to the sum of the current levels. 22) B) parallel only. D) either series or parallel. 23) 24) A series circuit with a voltage source of 15 V and a total resistance of 7500 Q will dissipate how much power? A) 0.3 W B) 30 mW C) 30 W D) 3W 25) A circuit has a source voltage of 15 V and two resistors in series with a total resistance of 40000. If R₁ has a potential drop of 9.375 V across it, what is the value of R2? A) 1500 Q B) 2000 Q C) 1000 D) 500 Q 26) A series circuit dissipates a total of 56.25 mW of power with a current of 3.75 mA. If R2 dissipates 21.09 mW of power, what is the value of R1? A) 1500 Q B) 2500 Q C) 1000 D) 2000 Q 27) If two 9 V batteries were connected in series (negative to positive) and a third battery was added in series (positive to negative) the total voltage would be A) 4.5 V. B) 0 V. C)9 V. 28) Which of the following will apply to the largest resistor in a series circuit? A) Has the greatest voltage drop D) 18 V. B) Dissipates the least amount of power C) Has a voltage drop equal to the other resistors in the circuit D) Has the largest current going through it 29) Which of the following is specified by the double-subscript notation in Vab--15 V? A) Point a has a higher potential than b. B) Point a has a lower potential than b. C) Point a has the same potential as b. D) Points a and b have an effective potential difference of 30 V. SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 30) See Figure 5.4. Use Kirchhoff's voltage law to compute Vab. Vao Vbo and Vde. 5.6 e www + a TA 1 kQ. 20 V d C 2 ΚΩ 4kQ www 6 kQ b 30) Figure 5.4 24) 25) 26) 27) 28) 29) 31) See Figure 5.5. Use Kirchhoff's voltage law to calculate Vab. Ved, and Vd. a 3 ΚΩ w b 5 V C 10 V Figure 5.5 d 10 ΚΩ 2ΚΩ 32) See Figure 5.6. Use the voltage divider rule to choose R2 such that VR1 = 30 V. + R1 1 kQ + 100 V R₂ Figure 5.6 In parallel? R32kQ 33) A circuit has two resistors R₁ = 502 and R2 = 150 and a 20 V DC power supply connected in series. What current flows through the series circuit? 31) 32) 33)