College Physics Study Set 7

Physics & Astronomy

Quiz 17 :

Current and Resistance

Quiz 17 :

Current and Resistance

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How long is a wire made from 100 cm3 of copper if its resistance is 8.5 ohms? The resistivity of copper is 1.7 * 10-5 W·m.
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A

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Materials having resistance changes as voltage or current varies are called:
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C

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The number density of conduction electrons in a metal can be found from the density r of the metal, the mass per mole M of the metal, the number of conduction electrons per metal atom, and Avogadro's number NA.If we assume one conduction electron per atom, which of the following gives the number density of conduction electrons for a given metal?
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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 W·m and the resistivity of aluminum is 2.82 * 10-5 W·m.
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A flashlight bulb operating at a voltage of 4.5 V has a resistance of 8.0 W.How many electrons pass through the bulb filament per second (e = 1.6 * 10-19 C)?
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The current in an electron beam in a cathode-ray tube is measured to be 70 µA.How many electrons hit the screen in 5.0 s? (e = 1.6 * 10-19 C)
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The unit of electric resistance, the ohm, is equivalent to which of the following?
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If a certain resistor obeys Ohm's law, its resistance will change:
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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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You measure a 25.0-V potential difference across a 5.00-W resistor.What is the current flowing through it?
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If a metallic wire of cross sectional area 3.0 * 10-6 m2 carries a current of 6.0 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 * 10-19 C)
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In a certain material there is a current of 16 A flowing through a surface to the right, 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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When you flip a switch to turn on a light, the delay before the light turns on is determined by:
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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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The unit of electric current, the ampere, is equivalent to which of the following?
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If the current in a wire is tripled, what effect does this have on the electron drift velocity in the wire?
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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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A metallic conductor has a resistivity of 18 * 10-6 Wm.What is the resistance of a piece that is 30 m long and has a uniform cross sectional area of 3.0 * 10-6 m2?
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Wire A and Wire B are each carrying the same current.If the diameter of Wire A is twice that of Wire B, how does the drift velocity vdA in Wire A compare to that in in Wire B?
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A wire carries a steady current of 0.1 A over a period of 20 s.What total charge passes through the wire in this time interval?
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