What current is flowing in a resistor if 4.0 × 1016 electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10-19 C)

A) 0.013 A B) 0.31 A C) 6.3 A D) 78 A A) 0.013 A B) 0.31 A C) 6.3 A D) 78 A

In the circuit shown in the figure,R1 = 60 Ω,R2 = 120 Ω,R3 = 180 Ω,V1 = 3.0 V,V2 = 6.0 V,and the batteries are both ideal.What is the current through R1?

A) 0.050 A B) 0.030 A C) 0.00 A D) 2.68 A A) 0.050 A B) 0.030 A C) 0.00 A D) 2.68 A

Exam 21: Electric Current and Direct-Current Circuits

For the circuit shown in the figure,the current in the 8.0-Ω resistor is 0.50A.What is the current in the 2.0-Ω resistor? All the numbers shown are accurate to two significant figures.

(Multiple Choice)

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Question 181

What current is flowing in a resistor if 4.0 × 10¹⁶ electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10^-19C)

(Multiple Choice)

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Question 182

What current is flowing in a wire if 0.67 C of charge pass a point in the wire in 0.30 s?

(Multiple Choice)

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Question 183

For the circuit shown in the figure,V = 20 V,C = 10 µF,R = 0.80 MΩ,and the battery is ideal.Initially the switch S is open and the capacitor is uncharged.The switch is then closed at time t = 0.00 s.What is the potential difference across the resistor 20 s after closing the switch?

(Multiple Choice)

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Question 184

A 100-W light bulb is operated by a 110-V dc source.What is the resistance of this bulb?

(Multiple Choice)

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Question 185

For the circuit shown in the figure,what is the power dissipated in the 2.0-Ω resistor? All the numbers shown are accurate to three significant figures.

(Multiple Choice)

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Question 186

When two or more different capacitors are connected in series across a potential source,which of the following statements must be true? (There could be more than one correct choice. )

(Multiple Choice)

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Question 187

A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side.An ohmmeter measures 0.040 Ω across its ends.What is the resistivity of the material from which this rod is made?

(Multiple Choice)

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Question 188

A 5.0-μF,a 14-μF,and a 21-μF capacitor are connected in series.How much capacitance would a single capacitor need to have to replace the three capacitors?

(Multiple Choice)

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Question 189

How much charge must pass by a point in a wire in 10 s for the current in the wire to be 0.50 A?

(Multiple Choice)

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Question 190

When a potential difference is applied across a piece of wire made of metal A,a Current flows.If the metal-A wire is replaced with a wire made of metal B having twice the diameter of the metal-A wire,how much current will flow through the metal-B wire? The lengths of both wires are the same,and the voltage difference remains unchanged.The resistivity of metal A is 1.68 × 10^-8 Ω ∙ m,and the resistivity of metal B is 1.59 × 10^-8 Ω ∙ m.

(Multiple Choice)

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Question 191

The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm.The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10^-6 Ω ∙ m.The toaster is designed to operate at a voltage of 120 V.How much power does it draw in normal operation?

(Multiple Choice)

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Question 192

A 1500-W heater is connected to a 120-V line for 2.0 hours.How much heat energy is produced?

(Multiple Choice)

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Question 193

In the circuit shown in the figure,R₁ = 60 Ω,R₂ = 120 Ω,R₃ = 180 Ω,V₁ = 3.0 V,V₂ = 6.0 V,and the batteries are both ideal.What is the current through R₁?

(Multiple Choice)

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Question 194

The voltage drop across a metal bar is While a current of Flows through it.How much power does this bar dissipate?

(Multiple Choice)

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Question 195

A 12-V battery is connected across a 100-Ω resistor.How many electrons flow through the wire in 1.0 min? (e = 1.60 × 10^-19C)

(Multiple Choice)

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Question 196

A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10^-6 Ω ∙ m.When this wire carries a current of 0.50 A,what is the voltage across its ends?

(Multiple Choice)

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Question 197

A battery is rated at 12 V and 160 A-h.How much energy does this battery store?

(Multiple Choice)

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Question 198

For the circuit shown in the figure,V = 60 V,C = 40 µF,R = 0.90 MΩ,and the battery is ideal.Initially the switch S is open and the capacitor is uncharged.The switch is then closed at time t = 0.00 s.At a given instant after closing the switch,the potential difference across the capacitor is twice the potential difference across the resistor.At that instant,what is the charge on the capacitor?

(Multiple Choice)

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Question 199

A resistor,an uncharged capacitor,a dc voltage source,and an open switch are all connected in series.The switch is closed at time t = 0 s.Which one of the following is a correct statement about the circuit?

(Multiple Choice)

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Question 200

Showing 181 - 200 of 228

Exam 21: Electric Current and Direct-Current Circuits

For the circuit shown in the figure,the current in the 8.0-Ω resistor is 0.50A.What is the current in the 2.0-Ω resistor? All the numbers shown are accurate to two significant figures.

What current is flowing in a resistor if 4.0 × 1016 electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10-19 C)

What current is flowing in a wire if 0.67 C of charge pass a point in the wire in 0.30 s?

For the circuit shown in the figure,V = 20 V,C = 10 µF,R = 0.80 MΩ,and the battery is ideal.Initially the switch S is open and the capacitor is uncharged.The switch is then closed at time t = 0.00 s.What is the potential difference across the resistor 20 s after closing the switch?

A 100-W light bulb is operated by a 110-V dc source.What is the resistance of this bulb?

For the circuit shown in the figure,what is the power dissipated in the 2.0-Ω resistor? All the numbers shown are accurate to three significant figures.

When two or more different capacitors are connected in series across a potential source,which of the following statements must be true? (There could be more than one correct choice. )

A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side.An ohmmeter measures 0.040 Ω across its ends.What is the resistivity of the material from which this rod is made?

A 5.0-μF,a 14-μF,and a 21-μF capacitor are connected in series.How much capacitance would a single capacitor need to have to replace the three capacitors?

How much charge must pass by a point in a wire in 10 s for the current in the wire to be 0.50 A?

The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm.The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 Ω ∙ m.The toaster is designed to operate at a voltage of 120 V.How much power does it draw in normal operation?

A 1500-W heater is connected to a 120-V line for 2.0 hours.How much heat energy is produced?

In the circuit shown in the figure,R1 = 60 Ω,R2 = 120 Ω,R3 = 180 Ω,V1 = 3.0 V,V2 = 6.0 V,and the batteries are both ideal.What is the current through R1?

The voltage drop across a metal bar is While a current of Flows through it.How much power does this bar dissipate?

A 12-V battery is connected across a 100-Ω resistor.How many electrons flow through the wire in 1.0 min? (e = 1.60 × 10-19C)

A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10-6 Ω ∙ m.When this wire carries a current of 0.50 A,what is the voltage across its ends?

A battery is rated at 12 V and 160 A-h.How much energy does this battery store?

A resistor,an uncharged capacitor,a dc voltage source,and an open switch are all connected in series.The switch is closed at time t = 0 s.Which one of the following is a correct statement about the circuit?

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What current is flowing in a resistor if 4.0 × 10¹⁶ electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10^-19C)

The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm.The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10^-6 Ω ∙ m.The toaster is designed to operate at a voltage of 120 V.How much power does it draw in normal operation?

In the circuit shown in the figure,R₁ = 60 Ω,R₂ = 120 Ω,R₃ = 180 Ω,V₁ = 3.0 V,V₂ = 6.0 V,and the batteries are both ideal.What is the current through R₁?

A 12-V battery is connected across a 100-Ω resistor.How many electrons flow through the wire in 1.0 min? (e = 1.60 × 10^-19C)

A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10^-6 Ω ∙ m.When this wire carries a current of 0.50 A,what is the voltage across its ends?