A 120-m long copper wire (resistivity 1.68 × 10-8 . m) has resistance 6.0 . What is the diameter of the wire?

A) 0.65 m B) 0.65 mm C) 0.065 mm D) 0.65 cm A) 0.65 m B) 0.65 mm C) 0.065 mm D) 0.65 cm

A 2.0 meter long Aluminum wire (R = 0.44m P= 2.82 × 10-8 -m, $\alpha$= 4.29 × 10-3C-1) is connected in series to an 8.0 meter long Tungsten wire (R = 0.20m P= 5.6 × 10-8 -m,$\alpha$ = 4.5 × 10-3C-1). What is the resistance of the combination if the wire is heated to 150.° C? Assume the initial temperature for both wires is room temperature (20°C)

A) 0.78 B) 0.69 C) 0.88 D) 1.00 E) 0.64 A) 0.78 B) 0.69 C) 0.88 D) 1.00 E) 0.64

Exam 17: Electric Current and Resistance

A 25. meter long wire, of diameter 0.30 mm, connected to 3.00 volts draws 0.499 A. (a) What is the resistance of the wire? (b) What is its resistivity? (c) What is its conductivity?

Free

(Essay)

4.9/5

(36)

Question 1

Correct Answer:

Verified

(a) 6.01 Ω
(b) 1.70 × 10^-8 Ω ∙ m
(c) 5.88 × 10⁷ Ω^-1 m^-1

Appliances in the USA are designed to work on 110-120 V, whereas appliances in Europe operate on 220-240 V. What would happen if you tried to use a European electric shaver in this country?

Free

(Multiple Choice)

4.8/5

(36)

Question 2

Correct Answer:

Verified

In the graph shown in Figure 17-7, what physical quantity does the slope represent?

Free

(Multiple Choice)

4.8/5

(41)

Question 3

Correct Answer:

Verified

The resistance of an object is defined as

(Multiple Choice)

4.8/5

(38)

Question 4

Figure 17-3 is the symbol for a

(Multiple Choice)

5.0/5

(34)

Question 5

A coffee maker, which draws 13.5 A of current, has been left on for 10.0 min. What is the net number of electrons that have passed through the coffee maker?

(Short Answer)

5.0/5

(23)

Question 6

A battery has an internal resistance of 2 . This battery delivers maximum power to a load resistor that has a value of

(Multiple Choice)

4.8/5

(45)

Question 7

Which of the graphs in Figure 17-5 indicates that a positive temperature coefficient is obeyed for the entire range shown?

(Multiple Choice)

4.8/5

(35)

Question 8

A home appliance is rated at 250. watts ic connected to 120. V. (a) What current does it draw? (b) What is its resistance? (c) How many kw-h does it use in one 24-hour day?

(Short Answer)

4.7/5

(38)

Question 9

The heating element in an electric drier operates on 240. V and generates heat at the rate of 2.00 kW. The heating element shorts out and, in repairing it, the owner shortens the Nichrome wire by 10%. (Assume the temperature is unchanged, although in reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?

(Short Answer)

4.8/5

(29)

Question 10

A 120-m long copper wire (resistivity 1.68 × 10^-8 . m) has resistance 6.0 11eea3e1_dfc9_619a_97f4_13087e0a6d77_TB9720_11. What is the diameter of the wire?

(Multiple Choice)

4.8/5

(32)

Question 11

A 200. ? resistor is rated at 1/4 W. (a) What is the maximum current it can draw? (b) What is the maximum voltage that should be applied across it?

(Short Answer)

5.0/5

(32)

Question 12

The monthly (30 days) electric bill included the cost of running a central air-conditioning unit for 2 hr/day at 5000. W, and a series connection of ten 60. W lightbulbs for 5 hr/day. How much did these items contribute to the cost of the monthly electric bill if electricity costs 8¢ per kW-h?

(Short Answer)

4.7/5

(36)

Question 13

A motor that can do work at the rate of 2 hp has 60% efficiency. How much current does it draw from a 120. V line? (1 hp = 746 W)

(Short Answer)

4.9/5

(31)

Question 14

A 2.0 meter long Aluminum wire (R = 0.44m $A 2.0 meter long Aluminum wire (R = 0.44m P= 2.82 × 10-8 -m, \alpha = 4.29 × 10-3C-1) is connected in series to an 8.0 meter long Tungsten wire (R = 0.20m P= 5.6 × 10-8 -m, \alpha = 4.5 × 10-3C-1). What is the resistance of the combination if the wire is heated to 150.° C? Assume the initial temperature for both wires is room temperature (20°C)$ P= 2.82 × 10^-8 11eea3e1_9524_0969_97f4_7b1899809f65_TB9720_11-m, $\alpha$ = 4.29 × 10^-3C^-1) is connected in series to an 8.0 meter long Tungsten wire (R = 0.20m $A 2.0 meter long Aluminum wire (R = 0.44m P= 2.82 × 10-8 -m, \alpha = 4.29 × 10-3C-1) is connected in series to an 8.0 meter long Tungsten wire (R = 0.20m P= 5.6 × 10-8 -m, \alpha = 4.5 × 10-3C-1). What is the resistance of the combination if the wire is heated to 150.° C? Assume the initial temperature for both wires is room temperature (20°C)$ P= 5.6 × 10^-8 11eea3e1_dfc9_619a_97f4_13087e0a6d77_TB9720_11-m, $\alpha$ = 4.5 × 10^-3C^-1). What is the resistance of the combination if the wire is heated to 150.° C? Assume the initial temperature for both wires is room temperature (20°C)

(Multiple Choice)

4.8/5

(44)

Question 15

A battery acquires and stores

(Multiple Choice)

4.9/5

(41)

Question 16

A device that doesn't obey Ohm's law is a

(Multiple Choice)

4.7/5

(30)

Question 17

Figure 17-4 is a symbol for which of the following?

(Multiple Choice)

4.9/5

(38)

Question 18

A flashlight draws 0.133 A from a 3.0 volt battery pack. In 2.0 minutes: (a) how much charge flows from the battery? (b) how much energy was supplied by the battery? (c) how many electrons passed any point in the circuit every second?

(Short Answer)

4.9/5

(31)

Question 19

Which of the graphs in Figure 17-6 below indicates that the material is likely a semiconductor?

(Multiple Choice)

4.8/5

(34)

Question 20

Showing 1 - 20 of 59

Exam 17: Electric Current and Resistance

A 25. meter long wire, of diameter 0.30 mm, connected to 3.00 volts draws 0.499 A. (a) What is the resistance of the wire? (b) What is its resistivity? (c) What is its conductivity?

Appliances in the USA are designed to work on 110-120 V, whereas appliances in Europe operate on 220-240 V. What would happen if you tried to use a European electric shaver in this country?

In the graph shown in Figure 17-7, what physical quantity does the slope represent?

The resistance of an object is defined as

Figure 17-3 is the symbol for a

A coffee maker, which draws 13.5 A of current, has been left on for 10.0 min. What is the net number of electrons that have passed through the coffee maker?

A battery has an internal resistance of 2 . This battery delivers maximum power to a load resistor that has a value of

Which of the graphs in Figure 17-5 indicates that a positive temperature coefficient is obeyed for the entire range shown?

A home appliance is rated at 250. watts ic connected to 120. V. (a) What current does it draw? (b) What is its resistance? (c) How many kw-h does it use in one 24-hour day?

A 120-m long copper wire (resistivity 1.68 × 10-8 . m) has resistance 6.0 11eea3e1_dfc9_619a_97f4_13087e0a6d77_TB9720_11. What is the diameter of the wire?

A 200. ? resistor is rated at 1/4 W. (a) What is the maximum current it can draw? (b) What is the maximum voltage that should be applied across it?

The monthly (30 days) electric bill included the cost of running a central air-conditioning unit for 2 hr/day at 5000. W, and a series connection of ten 60. W lightbulbs for 5 hr/day. How much did these items contribute to the cost of the monthly electric bill if electricity costs 8¢ per kW-h?

A motor that can do work at the rate of 2 hp has 60% efficiency. How much current does it draw from a 120. V line? (1 hp = 746 W)

A battery acquires and stores

A device that doesn't obey Ohm's law is a

Figure 17-4 is a symbol for which of the following?

A flashlight draws 0.133 A from a 3.0 volt battery pack. In 2.0 minutes: (a) how much charge flows from the battery? (b) how much energy was supplied by the battery? (c) how many electrons passed any point in the circuit every second?

Which of the graphs in Figure 17-6 below indicates that the material is likely a semiconductor?

Measurement and Problem Solving

Kinematics: Description of Motion

Motion in Two Dimensions

Force and Motion

Work and Energy

Linear Momentum and Collisions

Circular Motion and Gravitation

Rotational Motion and Equilibrium

Solids and Fluids

Temperature and Kinetic Theory

Heat

Thermodynamics

Vibrations and Waves

Sound

Electric Charge, Forces, and Fields

Electric Potential, Energy, and Capacitance

Basic Electric Circuits

Magnetism

Electromagnetic Induction and Waves

AC Circuits

Reflection and Refraction of Light

Mirrors and Lenses

Physical Optics: The Wave Nature of Light

Vision and Optical Instruments

Relativity

Quantum Physics

Quantum Mechanics and Atomic Physics

The Nucleus

Nuclear Reactions and Elementary Particles

Filters

A 120-m long copper wire (resistivity 1.68 × 10^-8 . m) has resistance 6.0 11eea3e1_dfc9_619a_97f4_13087e0a6d77_TB9720_11. What is the diameter of the wire?