physics chpt 21 quantitative

C) 72 W

A light bulb operating at a voltage of 120 V has a resistance of 200 Ω. What is the power? A) 100 W B) 60 W C) 72 W D) 14 × 10-3 W E) 7.2 W

C) 0.5 A

A light bulb operating at a voltage of 120 Volt has a power of 60 W. What is the current flowing through this bulb? A) 1.5 A B) 2.5 A C) 0.5 A D) 2 A E) 1 A

C) 8 omega

A number of resistors are connected across points A and B as shown in Figure 21-13. What is the equivalent resistance between points A and B? A) 4 Ω B) 6 Ω C) 8 Ω D) 10 Ω E) 12 Ω

C) 8 omega

A number of resistors are connected across points A and B as shown in Figure 21-14. What is the equivalent resistance between points A and B? A) 4 Ω B) 6 Ω C) 8 Ω D) 10 Ω E) 12 Ω

D) 121 omega

A 100-W light bulb is connected to a 110-V source. What is the resistance of this bulb? A) 100 Ω B) 8.00 × 10-3 Ω C) 6.00 × 10-3 Ω D) 121 Ω E) 242 Ω

D) 480 J

A simple circuit has a total resistance of 30 Ω. If a 2.0-A current is maintained in this circuit, how much energy is dissipated in this circuit in 4.0 seconds? A) 24 J B) 4.8 J C) 48 J D) 480 J E) 6.0 J

D) 3.3 uF

A system of capacitors is connected across a 90 V DC voltage source as shown in Figure 21-18. What is the equivalent capacitance of this system? A) 1.5 μF B) 15 μF C) 3.6 μF D) 3.3 μF E) None of the other answers is correct.

D) 3.1 x 10^20

An electric device delivers a current of 5.0 A for 10 seconds. How many electrons flow through this device? A) 0.20 B) 20 C) 2.0 D) 3.1 × 1020 E) 31 × 1020

A) 1.0 omega

Five equal resistors, of value 2.0 Ω each, are connected as shown in Figure 21-8. What is the equivalent resistance of this circuit? A) 1.0 Ω B) 10.0 Ω C) 2.0 Ω D) 6.0 Ω E) 0.40 Ω

C) 30 V

Four capacitors are connected across a 90-V DC as shown in Figure 21-19. What is the voltage across the 6-μF capacitor? A) 10 V B) 20 V C) 30 V D) 60 V E) 90 V

A) 180 uC

Four capacitors are connected across a 90-V DC source as shown in Figure 21-19. What is the charge on the 3.0-μF capacitor? A) 180 μC B) 120 μC C) 90 μC D) 160 μC E) 240 μC

E) 120 uC

Four capacitors are connected across a 90-V DC source as shown in Figure 21-19. What is the charge on the 4.0-μF capacitor? A) 68 μC B) 90 μC C) 240 μC D) 180 μC E) 120 μC

D) 120 uC

Four capacitors are connected as shown in Figure 21-19. What is the charge on a 2.0-μF capacitor? A) 68 μC B) 90 μC C) 240 μC D) 120 μC E) 180 μC

E) 9 omega

The potential difference between the ends of a resistor is 9 V when a current of 1 A flows through it. What is the value of that resistor? A) 9 Ω s B) 9 Ω/s C) 9 V∙s D) 9 V/s E) 9 Ω

A) 10 V

The power rating of a 400 Ω resistor is 0.25 W. What is the maximum voltage? A) 10 V B) 20 V C) 30 V D) 40 V E) 50 V

A) 45 mA

The power rating of a resistor is 0.80 W. If the value of the resistor is 400 Ω, what is the maximum current it can draw? A) 45 mA B) 18 mA C) 4.4 mA D) 2.0 mA E) 320 mA

B) 17.9 V

The power rating of a resistor is 0.800 W. If the value of the resistor is 400 Ω, what is the maximum voltage? A) 110 V B) 17.9 V C) 170 V D) 1.80 V

B) 1.5 A

Three resistors of values 2 Ω, 6 Ω and 12 Ω are connected across a 2.0-V DC voltage source as shown in Figure 21-6. What is the total current I flowing this circuit? A) 0.70 A B) 1.5 A C) 2.0 A D) 3.0 A E) 6.0 A

B) 0.6 A

Three resistors of values 2 Ω, 6 Ω and 12 Ω are connected across a DC voltage source as shown in Figure 21-12. If the total current through the circuit is I = 5.0 A, what is the current through the 12 Ω resistor? A) 0.5 A B) 0.6 A C) 0.7 A D) 0.8 A E) 0.9 A

D) 2.7 V

Three resistors of values 2 Ω, 6 Ω and 12 Ω are connected across a DC voltage source as shown in Figure 21-5. If the total current through the circuit is 2.0 A, what is the applied voltage? A) 6.0 V B) 3.0 V C) 2.0 V D) 2.7 V E) 1.5 V

B) 12 uF

Two capacitors of 4 μF and 8 μF are connected in parallel. What is the equivalent capacitance of this system of capacitors? A) 0.4 μF B) 12 μF C) 2.7 μF D) 4 μF E) 6 μF

E) 0.91 A

A 100-W light bulb is connected to a 110-V source. What current flows through the lamp? A) 1.1 A B) 2.2 A C) 3.3 A D) 4.4 A E) 0.91 A

A) 20 V

A 100 V DC signal is applied to four resistors as shown in Figure 21-4. The values of the resistors are 20 Ω, 40 Ω, 60 Ω, and 80 Ω. What is the voltage across the 40 Ω resistor? A) 20 V B) 40 V C) 60 V D) 80 V E) 100 V

D) 25 V

A 100-V DC signal is applied to a series circuit composed of four equal resistors 10 Ω each. What is the voltage across each resistor? A) 10 V B) 15 V C) 20 V D) 25 V E) 50 V

D) 11 uC

A 2.0 μF and a 4.0 μF capacitor are connected in series across an 8.0-V DC source. What is the charge on the 2.0 μF capacitor? A) 2.0 μC B) 4.0 μC C) 12 μC D) 11 μC E) 25 μC

E) 1.8 A

A 200-W light bulb is connected across 110 V. What current will flow through this bulb? A) 0.90 A B) 0.36 A C) 0 A D) 0.60 A E) 1.8 A

E) 0.5 A

A 4-Ω resistor is connected in parallel with a 12-Ω resistor and this combination is connected to a 6-V DC power supply as shown in Figure 21-10. What is the current through the 12-Ω resistor? A) 1.5 A B) 2.0 A C) 2.5 A D) 3.0 A E) 0.5 A

C) 6 V

A 4-Ω resistor is connected in parallel with a 12-Ω resistor and this combination is connected to a DC power supply with voltage V as shown in Figure 21-3. If the total current in this circuit is 2 A, what is the value of voltage V? A) 2 V B) 3 V C) 6 V D) 1.5 V E) None of the other answers is correct.

E) 19 uC

A 4.0 μF and a 6.0 μF capacitor are connected in series across an 8.0-V DC source. What is the charge on the 6.0 μF capacitor? A) 2.0 μC B) 4.0 μC C) 12 μC D) 25 μC E) 19 μC

C) 68% of the maximum charge

A 4.0 μF capacitor is connected in series with a 2.0 kΩ resistor across a 20-V DC source and an open switch. If the switch is closed at t = 0 s, what is the charge on the capacitor at t = 9 ms? A) 0 C B) 37% of the minimum charge C) 68% of the maximum charge D) 68% of the minimum charge E) 96% of the maximum charge

E) 1.5 A

A 4.0-Ω resistor is connected in parallel with a 12-Ω resistor and both of these are connected to a DC power supply with voltage V as shown in Figure 21-9. If the total current in this circuit is 2.0 A, what is the current through the 4.0-Ω resistor? A) 2.0 A B) 2.5 A C) 0.5 A D) 3.0 A E) 1.5 A

E) 4.7 V

A 5.0 μF and a 7.0 μF capacitor are connected in series across an 8.0-V DC source. What is the voltage across the 5.0 μF capacitor? A) 0 V B) 8.0 V C) 2.7 V D) 3.6 V E) 4.7 V

E) 48 ms

A 8.0 μF capacitor is connected in series with a 6.0 kΩ resistor across a 20-V DC source and a switch. What is the time constant of this RC circuit? A) 9.0 ms B) 12 ms C) 40 ms D) 18 ms E) 48 ms

A) 0.25 A

Four resistors of 20 Ω, 40 Ω, 60 Ω, and 80 Ω are connected across a 50-V DC source. What is the current through this circuit? A) 0.25 A B) 0.50 A C) 0.75 A D) 2.0 A E) 4.0 A

E) 100 V

Four resistors of 20 Ω, 40 Ω, 60 Ω, and 80 Ω are connected across a DC voltage source. If the current through this circuit is 0.5 A, what is the voltage applied to this circuit? A) 20 V B) 40 V C) 60 V D) 80 V E) 100 V

B) 4 V

Four resistors of values 2 Ω, 4 Ω, 3 Ω, and 9 Ω are connected across a DC source with voltage V as shown in Figure 21-11. If the total current through this circuit is 1 A, what is the value of the voltage V? A) 2 V B) 4 V C) 6 V D) 8 V E) 10 V

B) 0.7 A

Four resistors of values 2 Ω, 4 Ω, 3 Ω, and 9 Ω are connected across an 8-V DC source as shown in Figure 21-16. What is the current through the 9-Ω resistor? A) 1 A B) 0.7 A C) 0.5 A D) 0.9 A E) 2 A

D) 1.3 A

Four resistors of values 2.0 Ω, 4.0 Ω, 3.0 Ω, and 9.0 Ω are connected across a DC source with voltage V as shown in Figure 21-15. If the total current through this circuit is 2.0 A, what is the current through the 4-Ω resistor? A) 1.0 A B) 2.0 A C) 3.0 A D) 1.3 A E) 2.4 A

B) 8 x 10^-4 omega m

The resistance of a 100-cm wire of cross sectional area 2 × 10-6 m2 is 400 Ω. What is the resistivity of the material of this wire? A) 0.8 × 10-4 Ωm B) 8 × 10-4 Ωm C) 0.8 × 10-5 Ωm D) 0.8 × 10-6 Ωm E) 8 × 10-6 Ωm

C) 1.7 mV

The resistivity of a 1.0 m long wire is 1.72 × 10-8 Ωm and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire? A) 17 mV B) 0.90 mV C) 1.7 mV D) 10 mV E) 90 mV

E) 0.0112 omega

The resistivity of the material of a wire is 1.76 × 10-8 Ωm. If the diameter of the wire is 2 × 10-3 m and its length is 2 m, what is its resistance? A) 112 Ω B) 11.2 Ω C) 1.12 Ω D) 0.112 Ω E) 0.0112 Ω

E) 1.3 omega

Three 2.0-Ω resistors are connected across the sides of an equilateral triangle ABC as shown in Figure 21-7. What is the equivalent resistance between any two points, AB, BC, or AC, of this circuit? A) 2.0 Ω B) 6.0 Ω C) 4.3 Ω D) 3.3 Ω E) 1.3 Ω

A) 1.7 uF

Three capacitors are connected as shown in Figure 21-17. What is the equivalent capacitance between points A and B? A) 1.7 μF B) 4.0 μC C) 7.1 μF D) 12 μF E) 8.0 μF