Assuming that there are 0.845 * 1029 electrons per m3 in a wire with cross sectional area 69 mm2 and drift velocity 4.12 * 10-8 m/s,what is the density current in the wire?

A) 557 A/m2 B) 348 A/m2 C) 300 A/m2 D) 807 A/m2 E) 652 A/m2 A) 557 A/m2 B) 348 A/m2 C) 300 A/m2 D) 807 A/m2 E) 652 A/m2

Consider this circuit.Let R1 = R2 = R3 = R4 = R5 = 10 $\varOmega$.If V= 20 V then what is the current IV going through the circuit?

A) 0.5 A B) 1.0 A C) 1.5 A D) 2.0 A E) 10.0 A A) 0.5 A B) 1.0 A C) 1.5 A D) 2.0 A E) 10.0 A

Assuming that there are 0.845 * 1029 electrons per m3 in a wire with cross sectional area 69 mm2 and drift velocity 4.12 * 10-8 m/s,what is the current in the wire?

A) 25 mA B) 38 mA C) 33 mA D) 30 mA E) 18 mA A) 25 mA B) 38 mA C) 33 mA D) 30 mA E) 18 mA

Exam 25: Current and Resistance

A 100-W light bulb is connected to a 120-V DC power outlet.If the wires leading to that power outlet have a resistance of 1.2 ohms,how much power is wasted in the connecting wires?

(Multiple Choice)

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Question 61

A 22-gauge copper wire has a radius of 0.645 mm,is 5.00 m long,and has a resistivity $\rho$ = 1.72 * 10^-8 $\varOmega$ m.The maximum current for which this wire is rated is 0.920A.What is the maximum electric potential difference that may be applied to this wire without overloading it?

(Multiple Choice)

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Question 62

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

(Multiple Choice)

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Question 63

Assuming that there are 0.845 * 10²⁹ electrons per m³ in a wire with cross sectional area 69 mm² and drift velocity 4.12 * 10^-8 m/s,what is the density current in the wire?

(Multiple Choice)

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Question 64

In the circuit shown,R₁ = 3 $\varOmega$ ,R₂ = 6 $\varOmega$ ,R₃ = 20 $\varOmega$ ,and $\varOmega$ = 12 V.Calculate the magnitude of current flowing through R₃ on the left branch of the circuit (marked with ☺). $In the circuit shown,R1 = 3 \varOmega ,R2 = 6 \varOmega ,R3 = 20 \varOmega ,and \varOmega = 12 V.Calculate the magnitude of current flowing through R3 on the left branch of the circuit (marked with ☺).$

(Multiple Choice)

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Question 65

Assuming there are 0.845 * 10²⁹ electrons per m³ and the drift velocity in a wire is 4.12 * 10^-8 m/s.If the current in the wire is 30 mA,what is the cross-sectional area of the wire?

(Multiple Choice)

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Question 66

A circuit consists of a copper wire of length 10 m and radius 1 mm.The wire is connected to a 10-V battery.An aluminum wire of length 5 m is connected to the same battery and dissipates the same amount of power.What is the radius of the aluminum wire?

(Multiple Choice)

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Question 67

A 12.0-V battery is connected to a 7.54-ohm resistor and a current of 0.999A is measured to flow through the resistor.How much power is dissipated as heat inside the battery?

(Multiple Choice)

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Question 68

What is the resistance of a 15.0-m long,24-gauge (0.511 mm diameter)copper wire? The resistivity of copper is 1.72 * 10^-8 $\varOmega$ m.

(Multiple Choice)

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Question 69

A ribbon of nichrome (resistivity = 1.00 * 10^-6 $\varOmega$ ·m)with a rectangular cross sectional area of (0.25 mm * 1.00 mm)will be used as a heating element in a toaster.How long should this ribbon be,if the total resistance is intended to be 1.5 $\varOmega$ ?

(Multiple Choice)

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Question 70

A ribbon of material with a rectangular cross sectional area of (0.25 mm * 1.00 mm),length 21.9 cm and resistance 1.5 $\varOmega$ is used as a heating element in a toaster.What is the resistivity of the material?

(Multiple Choice)

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Question 71

A copper wire is connected across a battery.The direction of the current in the wire is

(Multiple Choice)

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Question 72

The equivalent resistance of the circuit shown if .If and ,what is the resistance of R₁?

(Multiple Choice)

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Question 73

A 1-m copper wire with a radius of 0.5 mm is stretched to a distance of 2 m.What is the fractional change in resistance $\Delta$ R/R as the wire is stretched?

(Multiple Choice)

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Question 74

Consider this circuit.Let R₁ = R₂ = R₃ = R₄ = R₅ = 10 $\varOmega$ .If V= 20 V then what is the current I_V going through the circuit? $Consider this circuit.Let R1 = R2 = R3 = R4 = R5 = 10 \varOmega .If V= 20 V then what is the current IV going through the circuit?$

(Multiple Choice)

5.0/5

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Question 75

Two cylinders are made out of the same material and are of equal length as shown.The cylinders are connected to a battery with voltage Vb as shown.If the voltage drop across resistor R2 is 0.810 * Vb,what is the ratio of the radii r1/r2 of the two cylinders?

(Multiple Choice)

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Question 76

A potential difference of 0.994 V is applied across a 170 m long,11-gauge wire copper wire.What is the current in the wire?

(Multiple Choice)

4.8/5

(68)

Question 77

If the current through a resistor is increased by a factor of 4,how does this affect the power dissipated?

(Multiple Choice)

4.8/5

(74)

Question 78

Assuming that there are 0.845 * 10²⁹ electrons per m³ in a wire with cross sectional area 69 mm² and drift velocity 4.12 * 10^-8 m/s,what is the current in the wire?

(Multiple Choice)

4.8/5

(98)

Question 79

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 has 10 ohm of resistance.If you are using a 100-W bulb in the corroded socket at 120 V,the actual power dissipated in the bulb is

(Multiple Choice)

4.9/5

(81)

Question 80

Showing 61 - 80 of 80

Exam 25: Current and Resistance

A 100-W light bulb is connected to a 120-V DC power outlet.If the wires leading to that power outlet have a resistance of 1.2 ohms,how much power is wasted in the connecting wires?

A 22-gauge copper wire has a radius of 0.645 mm,is 5.00 m long,and has a resistivity ρ\rhoρ = 1.72 * 10-8 Ω\varOmegaΩ m.The maximum current for which this wire is rated is 0.920A.What is the maximum electric potential difference that may be applied to this wire without overloading it?

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

Assuming that there are 0.845 * 1029 electrons per m3 in a wire with cross sectional area 69 mm2 and drift velocity 4.12 * 10-8 m/s,what is the density current in the wire?

In the circuit shown,R1 = 3 Ω\varOmegaΩ ,R2 = 6 Ω\varOmegaΩ ,R3 = 20 Ω\varOmegaΩ ,and Ω\varOmegaΩ = 12 V.Calculate the magnitude of current flowing through R3 on the left branch of the circuit (marked with ☺).

Assuming there are 0.845 * 1029 electrons per m3 and the drift velocity in a wire is 4.12 * 10-8 m/s.If the current in the wire is 30 mA,what is the cross-sectional area of the wire?

A circuit consists of a copper wire of length 10 m and radius 1 mm.The wire is connected to a 10-V battery.An aluminum wire of length 5 m is connected to the same battery and dissipates the same amount of power.What is the radius of the aluminum wire?

A 12.0-V battery is connected to a 7.54-ohm resistor and a current of 0.999A is measured to flow through the resistor.How much power is dissipated as heat inside the battery?

What is the resistance of a 15.0-m long,24-gauge (0.511 mm diameter)copper wire? The resistivity of copper is 1.72 * 10-8 Ω\varOmegaΩ m.

A ribbon of nichrome (resistivity = 1.00 * 10-6 Ω\varOmegaΩ ·m)with a rectangular cross sectional area of (0.25 mm * 1.00 mm)will be used as a heating element in a toaster.How long should this ribbon be,if the total resistance is intended to be 1.5 Ω\varOmegaΩ ?

A ribbon of material with a rectangular cross sectional area of (0.25 mm * 1.00 mm),length 21.9 cm and resistance 1.5 Ω\varOmegaΩ is used as a heating element in a toaster.What is the resistivity of the material?

A copper wire is connected across a battery.The direction of the current in the wire is

The equivalent resistance of the circuit shown if .If and ,what is the resistance of R1?

A 1-m copper wire with a radius of 0.5 mm is stretched to a distance of 2 m.What is the fractional change in resistance Δ\DeltaΔ R/R as the wire is stretched?

Consider this circuit.Let R1 = R2 = R3 = R4 = R5 = 10 Ω\varOmegaΩ .If V= 20 V then what is the current IV going through the circuit?

Two cylinders are made out of the same material and are of equal length as shown.The cylinders are connected to a battery with voltage Vb as shown.If the voltage drop across resistor R2 is 0.810 * Vb,what is the ratio of the radii r1/r2 of the two cylinders?

A potential difference of 0.994 V is applied across a 170 m long,11-gauge wire copper wire.What is the current in the wire?

If the current through a resistor is increased by a factor of 4,how does this affect the power dissipated?

Assuming that there are 0.845 * 1029 electrons per m3 in a wire with cross sectional area 69 mm2 and drift velocity 4.12 * 10-8 m/s,what is the current in the wire?

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A 22-gauge copper wire has a radius of 0.645 mm,is 5.00 m long,and has a resistivity $\rho$ = 1.72 * 10^-8 $\varOmega$ m.The maximum current for which this wire is rated is 0.920A.What is the maximum electric potential difference that may be applied to this wire without overloading it?

Assuming that there are 0.845 * 10²⁹ electrons per m³ in a wire with cross sectional area 69 mm² and drift velocity 4.12 * 10^-8 m/s,what is the density current in the wire?

Assuming there are 0.845 * 10²⁹ electrons per m³ and the drift velocity in a wire is 4.12 * 10^-8 m/s.If the current in the wire is 30 mA,what is the cross-sectional area of the wire?

What is the resistance of a 15.0-m long,24-gauge (0.511 mm diameter)copper wire? The resistivity of copper is 1.72 * 10^-8 $\varOmega$ m.

A ribbon of nichrome (resistivity = 1.00 * 10^-6 $\varOmega$ ·m)with a rectangular cross sectional area of (0.25 mm * 1.00 mm)will be used as a heating element in a toaster.How long should this ribbon be,if the total resistance is intended to be 1.5 $\varOmega$ ?

A ribbon of material with a rectangular cross sectional area of (0.25 mm * 1.00 mm),length 21.9 cm and resistance 1.5 $\varOmega$ is used as a heating element in a toaster.What is the resistivity of the material?

The equivalent resistance of the circuit shown if .If and ,what is the resistance of R₁?

A 1-m copper wire with a radius of 0.5 mm is stretched to a distance of 2 m.What is the fractional change in resistance $\Delta$ R/R as the wire is stretched?

Assuming that there are 0.845 * 10²⁹ electrons per m³ in a wire with cross sectional area 69 mm² and drift velocity 4.12 * 10^-8 m/s,what is the current in the wire?