Assuming that the drift velocity in a wire of with cross sectional area 69 mm2 is 4.12 * 10-8 m/s and the current in the wire is current I = 30 mA,what is the density of electrons in the wire?

A) 0.812 * 1029 electrons per m3 B) 0.845 * 1029 electrons per m3 C) 0.702 * 1029 electrons per m3 D) 0.756 * 1029 electrons per m3 E) 0.660 * 1029 electrons per m3 A) 0.812 * 1029 electrons per m3 B) 0.845 * 1029 electrons per m3 C) 0.702 * 1029 electrons per m3 D) 0.756 * 1029 electrons per m3 E) 0.660 * 1029 electrons per m3 E

The resistivity of a metal at room temperature is 2.35 * 10-8 $\varOmega$*m.When the same metal is 150S1U1P1$\circ$S1S1P0C above room temperature,its resistivity is 4.55 * 10-8 $\varOmega$*m.What is the temperature coefficient for this metal?

A) 5.38 * 10-3/K. B) 3.98 * 10-3/K. C) 2.64 * 10-3/K. D) 6.24 *10-3/K. E) 7.15 * 10-3/K. A) 5.38 * 10-3/K. B) 3.98 * 10-3/K. C) 2.64 * 10-3/K. D) 6.24 *10-3/K. E) 7.15 * 10-3/K.

A current flows through an aluminum wire.The aluminum wire has a length of 2.00 m,a diameter of 0.0300 cm,and a carrier density of 6.02 * 1028 electrons/m3.If the electron drift velocity is 1.84 * 10-4 m/s,what is the current density in the wire?

A) 1.93 * 106 A/m2 B) 1.18 * 106 A/m2 C) 1.36 * 106 A/m2 D) 1.53 * 106 A/m2 E) 1.77 * 106 A/m2 A) 1.93 * 106 A/m2 B) 1.18 * 106 A/m2 C) 1.36 * 106 A/m2 D) 1.53 * 106 A/m2 E) 1.77 * 106 A/m2

The current of 0.15 A flows through three resistors,R1 = 20 Ohm,R2 = 50 Ohm,R3 = 65 Ohm,connected in series.What is the power dissipated in the R2 resistor?

A) 7.5 W B) 5.0 W C) 1.125 W D) 333 W E) 375 W A) 7.5 W B) 5.0 W C) 1.125 W D) 333 W E) 375 W

Exam 25: Current and Resistance

Assuming that the drift velocity in a wire of with cross sectional area 69 mm² is 4.12 * 10^-8 m/s and the current in the wire is current I = 30 mA,what is the density of electrons in the wire?

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Question 1

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A battery has an unloaded terminal voltage of 48 V.When a load of 15 $\varOmega$ is connected to the battery,the terminal voltage drops to 45.4 V.What is the internal resistance of the battery?

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Question 2

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A 10-ohm resistor is attached to a 20-ohm resistor in series.This combination is then attached to a 30-ohm resistor in parallel.This is then connected to a 120-V battery.What is the current flow through the 20-ohm resistor?

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Question 3

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A particular wire has a diameter of 1.7 mm and length of 1.3 m.If 45 $\mu$ V is the potential drop measured across the wire when 3.0 mA flow in it,what is the resistivity of the metal from which it is made?

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Question 4

In order to double the power dissipated in the resistor R,I should

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Question 5

A battery has an internal resistance of 1.3 $\varOmega$ and a voltage of 48.0 V.Is a load of 15.0 $\varOmega$ is connected to the battery,what is the current supplied by the battery

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Question 6

A current of 0.500 A flows through an aluminum wire.The aluminum wire has a length of 2.00 m,a diameter of 0.0300 cm,and a carrier density of 6.02 * 10²⁸ electrons/m³.What is the electron drift velocity in the wire?

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Question 7

A ribbon of nichrome (resistivity = 1.00 * 10^-6 $\varOmega$ ·m)with a rectangular cross sectional area and length 21.9 cm is used as a heating element in a toaster.What is the cross-sectional area of the ribbon,if the total resistance is intended to be 1.5 $\varOmega$ ?

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Question 8

The resistivity of gold at room temperature is 2.35 * 10^-8 $\varOmega$ m and its temperature coefficient is 3.9810^-3/K.At what temperature will its resistivity equal 4.55 10^-8 $\varOmega$ m?

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Question 9

A battery has an internal resistance of 1.3 $\varOmega$ and a voltage of 48.0 V.Is a load of 15.0 $\varOmega$ is connected to the battery,what is the voltage across the terminals of the battery?

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Question 10

The resistivity of a metal at room temperature is 2.35 * 10^-8 $\varOmega$ m.When the same metal is 150^$\circ$C above room temperature,its resistivity is 4.55 10^-8 $\varOmega$ *m.What is the temperature coefficient for this metal?

(Multiple Choice)

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Question 11

A current flows through an aluminum wire.The aluminum wire has a length of 2.00 m,a diameter of 0.0300 cm,and a carrier density of 6.02 * 10²⁸ electrons/m³.If the electron drift velocity is 1.84 * 10^-4 m/s,what is the current density in the wire?

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Question 12

What is the equivalent resistance of the circuit shown if , ,and ?

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Question 13

N identical resistors are connected in parallel.The resistance of one of them is equal to R.What is the equivalent resistance of all N resistors?

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Question 14

A copper wire of diameter 2 mm carries 12 A of current for an electric stove.Assuming the resistivity of copper of 1.7 * 10^-8 $\varOmega$ .m,the power dissipated in 2 m length of the wire is

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Question 15

In an emergency you need to power a radio that uses 25 W of power when attached to a 6.0-V power supply.The only power supply you have access to provides 120 V,but you do have a very large number of 4.0-ohm resistors.If you want the power in the radio to be as closes as possible to 25 W,how many resistors do you need to use?

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Question 16

After a long period of use,contacts in an electric bulb socket could corrode and introduce extra resistance in the circuit.Suppose a light bulb socket is very badly corroded and you are using a 100-W bulb in the corroded socket at 120 V.As a result,the actual power dissipated in the bulb is 80.0 W.What is the resistance of the badly corroded socket?

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Question 17

A 10-ohm resistor is attached to a 20-ohm resistor in series.This combination is then attached to a 30-ohm resistor in parallel.This is then connected to a 120-V battery.What is the current drawn from the battery?

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Question 18

A battery has an internal resistance of 1.3 $\varOmega$ and a voltage of 48 V.What is the load resistance which causes the voltage to drop to 45.4 V?

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Question 19

The current of 0.15 A flows through three resistors,R₁ = 20 Ohm,R₂ = 50 Ohm,R₃ = 65 Ohm,connected in series.What is the power dissipated in the R₂ resistor?

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Question 20

Showing 1 - 20 of 80

Exam 25: Current and Resistance

Assuming that the drift velocity in a wire of with cross sectional area 69 mm2 is 4.12 * 10-8 m/s and the current in the wire is current I = 30 mA,what is the density of electrons in the wire?

A battery has an unloaded terminal voltage of 48 V.When a load of 15 Ω\varOmegaΩ is connected to the battery,the terminal voltage drops to 45.4 V.What is the internal resistance of the battery?

A 10-ohm resistor is attached to a 20-ohm resistor in series.This combination is then attached to a 30-ohm resistor in parallel.This is then connected to a 120-V battery.What is the current flow through the 20-ohm resistor?

A particular wire has a diameter of 1.7 mm and length of 1.3 m.If 45 μ\muμ V is the potential drop measured across the wire when 3.0 mA flow in it,what is the resistivity of the metal from which it is made?

In order to double the power dissipated in the resistor R,I should

A battery has an internal resistance of 1.3 Ω\varOmegaΩ and a voltage of 48.0 V.Is a load of 15.0 Ω\varOmegaΩ is connected to the battery,what is the current supplied by the battery

A current of 0.500 A flows through an aluminum wire.The aluminum wire has a length of 2.00 m,a diameter of 0.0300 cm,and a carrier density of 6.02 * 1028 electrons/m3.What is the electron drift velocity in the wire?

A ribbon of nichrome (resistivity = 1.00 * 10-6 Ω\varOmegaΩ ·m)with a rectangular cross sectional area and length 21.9 cm is used as a heating element in a toaster.What is the cross-sectional area of the ribbon,if the total resistance is intended to be 1.5 Ω\varOmegaΩ ?

The resistivity of gold at room temperature is 2.35 * 10-8 Ω\varOmegaΩ *m and its temperature coefficient is 3.98*10-3/K.At what temperature will its resistivity equal 4.55 *10-8 Ω\varOmegaΩ *m?

A battery has an internal resistance of 1.3 Ω\varOmegaΩ and a voltage of 48.0 V.Is a load of 15.0 Ω\varOmegaΩ is connected to the battery,what is the voltage across the terminals of the battery?

The resistivity of a metal at room temperature is 2.35 * 10-8 Ω\varOmegaΩ *m.When the same metal is 150 ∘\circ∘ C above room temperature,its resistivity is 4.55 * 10-8 Ω\varOmegaΩ *m.What is the temperature coefficient for this metal?

A current flows through an aluminum wire.The aluminum wire has a length of 2.00 m,a diameter of 0.0300 cm,and a carrier density of 6.02 * 1028 electrons/m3.If the electron drift velocity is 1.84 * 10-4 m/s,what is the current density in the wire?

What is the equivalent resistance of the circuit shown if , ,and ?

N identical resistors are connected in parallel.The resistance of one of them is equal to R.What is the equivalent resistance of all N resistors?

A copper wire of diameter 2 mm carries 12 A of current for an electric stove.Assuming the resistivity of copper of 1.7 * 10-8 Ω\varOmegaΩ .m,the power dissipated in 2 m length of the wire is

A 10-ohm resistor is attached to a 20-ohm resistor in series.This combination is then attached to a 30-ohm resistor in parallel.This is then connected to a 120-V battery.What is the current drawn from the battery?

A battery has an internal resistance of 1.3 Ω\varOmegaΩ and a voltage of 48 V.What is the load resistance which causes the voltage to drop to 45.4 V?

The current of 0.15 A flows through three resistors,R1 = 20 Ohm,R2 = 50 Ohm,R3 = 65 Ohm,connected in series.What is the power dissipated in the R2 resistor?

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Assuming that the drift velocity in a wire of with cross sectional area 69 mm² is 4.12 * 10^-8 m/s and the current in the wire is current I = 30 mA,what is the density of electrons in the wire?

A battery has an unloaded terminal voltage of 48 V.When a load of 15 $\varOmega$ is connected to the battery,the terminal voltage drops to 45.4 V.What is the internal resistance of the battery?

A particular wire has a diameter of 1.7 mm and length of 1.3 m.If 45 $\mu$ V is the potential drop measured across the wire when 3.0 mA flow in it,what is the resistivity of the metal from which it is made?

A battery has an internal resistance of 1.3 $\varOmega$ and a voltage of 48.0 V.Is a load of 15.0 $\varOmega$ is connected to the battery,what is the current supplied by the battery

A current of 0.500 A flows through an aluminum wire.The aluminum wire has a length of 2.00 m,a diameter of 0.0300 cm,and a carrier density of 6.02 * 10²⁸ electrons/m³.What is the electron drift velocity in the wire?

A ribbon of nichrome (resistivity = 1.00 * 10^-6 $\varOmega$ ·m)with a rectangular cross sectional area and length 21.9 cm is used as a heating element in a toaster.What is the cross-sectional area of the ribbon,if the total resistance is intended to be 1.5 $\varOmega$ ?

The resistivity of gold at room temperature is 2.35 * 10^-8 $\varOmega$ m and its temperature coefficient is 3.9810^-3/K.At what temperature will its resistivity equal 4.55 10^-8 $\varOmega$ m?

A battery has an internal resistance of 1.3 $\varOmega$ and a voltage of 48.0 V.Is a load of 15.0 $\varOmega$ is connected to the battery,what is the voltage across the terminals of the battery?

The resistivity of a metal at room temperature is 2.35 * 10^-8 $\varOmega$ m.When the same metal is 150^$\circ$C above room temperature,its resistivity is 4.55 10^-8 $\varOmega$ *m.What is the temperature coefficient for this metal?

A current flows through an aluminum wire.The aluminum wire has a length of 2.00 m,a diameter of 0.0300 cm,and a carrier density of 6.02 * 10²⁸ electrons/m³.If the electron drift velocity is 1.84 * 10^-4 m/s,what is the current density in the wire?

A copper wire of diameter 2 mm carries 12 A of current for an electric stove.Assuming the resistivity of copper of 1.7 * 10^-8 $\varOmega$ .m,the power dissipated in 2 m length of the wire is

A battery has an internal resistance of 1.3 $\varOmega$ and a voltage of 48 V.What is the load resistance which causes the voltage to drop to 45.4 V?

The current of 0.15 A flows through three resistors,R₁ = 20 Ohm,R₂ = 50 Ohm,R₃ = 65 Ohm,connected in series.What is the power dissipated in the R₂ resistor?