College Physics Reasoning and Relationships

Physics & Astronomy

Quiz 19 :

Electric Currents and Circuits

Quiz 19 :

Electric Currents and Circuits

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When an electric current exists within a conducting wire, which of the following statements describes the condition of any accompanying electric field?
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B

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You measure a 20.0-V potential difference across a 5.00- resistor. What is the current flowing through it?
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B

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Two wires with the same resistance have the same diameter but different lengths. If wire 1 has length L1 and wire 2 has length L2, how do L1 and L2 compare if wire 1 is made from copper and wire 2 is made from aluminum? The resistivity of copper is 1.7 10-5 ·m and the resistivity of aluminum is 2.82 10-5 ·m.
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D

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The current in an electron beam in a cathode-ray tube is measured to be 280 µA. How many electrons hit the screen in 50 s? (e = 1.6 1019 C)
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A 12.6-V battery supplies a 2.0-A current for 2.0 minutes. What is the work done by the battery during this process?
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Wire A and Wire B are each carrying the same current. If the diameter of Wire A is half that of Wire B, how does the drift velocity vdA in Wire A compare to that in Wire B?
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In a certain material there is a current of 16 A flowing through a surface to the left, and there is an equal amount of positive and negative charge passing through the surface producing the current. How much negative charge passes through the surface?
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The size of the electric current in a electrical conductor is a function of which of the following?
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Two cylindrical resistors are made of the same material and have the same resistance. The resistors, R1 and R2, have different radii, r1 and r2, and different lengths, L1 and L2. Which of the following relative values for radii and lengths would result in equal resistances?
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If a metallic wire of cross-sectional area 3.0 106 m2 carries a current of 9.1 A and has a mobile charge density of 4.24 1028 carriers/m3, what is the average drift velocity of the mobile charge carriers? (charge value = 1.6 1019 C)
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How long is a wire made from 200 cm3 of copper if its resistance is 8.5 ohms? The resistivity of copper is 1.7 10-5 ·m.
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When you flip a switch to turn on a light, the delay before the light turns on is determined by:
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A lightbulb drawing a current of 0.60 A is run for 2.0 hours. How many electrons pass through the bulb during this process?
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A metallic conductor has a resistivity of 18 106 m. What is the resistance of a piece that is 15 m long and has a uniform cross sectional area of 6.0 106 m2?
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A Nichrome wire has a radius of 0.50 mm and a resistivity of 1.5 106 m. If the wire carries a current of 1.0 A, what is the potential difference per unit length along this wire?
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The unit of electric current, the ampere, is equivalent to which of the following?
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A 300-A·h battery can deliver how many coulombs starting from a full charge?
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A 0.10-m long metal rod has a radius of 1.0 cm and a resistance of 3.2 105 . What is the resistivity of the metal?
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If the current in a wire is halved, what effect does this have on the electron drift velocity in the wire?
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A wire carries a steady current of 0.1 A over a period of 200 s. What total charge passes through the wire in this time interval?
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