Explanation Write the expression for the current. I = n A q v d (I) Here, I is the current, n is the density of electrons, A is the area, q is the charge, v d is the drift velocity. Write the expression for n . n = ρ m (II) Here, ρ is the density of aluminium, m is the mass per atom. Write the expression for m . m = M N A (III) Here, M is the molar mass, N A is the Avogadro’s number. Use equation (III) in (II) to solve for n . n = ρ N A M (IV) Use equation (I) to solve for v d . v d = I n q A (V) Conclusion: Substitute 6.02 × 10 23 atoms for N A , 2

Principles of Physics: A Calculus-Based Text

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Author: Raymond A. Serway, John W. Jewett

Publisher: Cengage Learning

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Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends o…

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Chapter 21, Problem 7P

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The drift velocity of the electrons in the wire.

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Principles of Physics: A Calculus-Based Text

Ch. 21.1 - Consider positive and negative charges moving...Ch. 21.2 - Prob. 21.2QQ Ch. 21.2 - When does an incandescent lightbulb carry more...Ch. 21.5 - For the two incandescent lightbulbs shown in...Ch. 21.7 - Prob. 21.5QQ Ch. 21.7 - With the switch in the circuit of Figure 21.18a...Ch. 21.7 - Prob. 21.7QQ Ch. 21.9 - Consider the circuit in Figure 21.29 and assume...Ch. 21 - If the terminals of a battery with zero internal...Ch. 21 - Wire B has twice the length and twice the radius...

Ch. 21 - The current-versus-voltage behavior of a certain...Ch. 21 - Prob. 4OQ Ch. 21 - A potential difference of 1.00 V is maintained...Ch. 21 - Prob. 6OQ Ch. 21 - A metal wire of resistance R is cut into three...Ch. 21 - The terminals of a battery are connected across...Ch. 21 - Prob. 9OQ Ch. 21 - Two conducting wires A and B of the same length...Ch. 21 - When resistors with different resistances are...Ch. 21 - When operating on a 120-V circuit, an electric...Ch. 21 - Prob. 13OQ Ch. 21 - Prob. 14OQ Ch. 21 - In the circuit shown in Figure OQ21.15, each...Ch. 21 - Prob. 1CQ Ch. 21 - Prob. 2CQ Ch. 21 - Prob. 3CQ Ch. 21 - Referring to Figure CQ21.4, describe what happens...Ch. 21 - When the potential difference across a certain...Ch. 21 - Use the atomic theory of matter to explain why the...Ch. 21 - Prob. 7CQ Ch. 21 - (a) What advantage does 120-V operation offer over...Ch. 21 - Prob. 9CQ Ch. 21 - Prob. 10CQ Ch. 21 - If you were to design an electric heater using...Ch. 21 - Prob. 12CQ Ch. 21 - Prob. 13CQ Ch. 21 - Prob. 14CQ Ch. 21 - Why is it possible for a bird to sit on a...Ch. 21 - Prob. 1P Ch. 21 - Prob. 2P Ch. 21 - The quantity of charge q (in coulombs) that has...Ch. 21 - Prob. 4P Ch. 21 - Prob. 5P Ch. 21 - Figure P21.6 represents a section of a conductor...Ch. 21 - Prob. 7P Ch. 21 - A 0.900-V potential difference is maintained...Ch. 21 - Prob. 9P Ch. 21 - A lightbulb has a resistance of 240 when...Ch. 21 - Prob. 11P Ch. 21 - Prob. 12P Ch. 21 - While taking photographs in Death Valley on a day...Ch. 21 - Prob. 14P Ch. 21 - If the current carried by a conductor is doubled,...Ch. 21 - Prob. 16P Ch. 21 - Prob. 17P Ch. 21 - Prob. 18P Ch. 21 - Prob. 19P Ch. 21 - Prob. 20P Ch. 21 - Prob. 21P Ch. 21 - Prob. 22P Ch. 21 - Prob. 23P Ch. 21 - Prob. 24P Ch. 21 - A 100-W lightbulb connected to a 120-V source...Ch. 21 - Prob. 26P Ch. 21 - Prob. 27P Ch. 21 - Prob. 28P Ch. 21 - A toaster is rated at 600 W when connected to a...Ch. 21 - Prob. 30P Ch. 21 - Prob. 31P Ch. 21 - Review. A well-insulated electric water heater...Ch. 21 - A battery has an emf of 15.0 V. The terminal...Ch. 21 - Two 1.50-V batterieswith their positive terminals...Ch. 21 - An automobile battery has an emf of 12.6 V and an...Ch. 21 - Prob. 36P Ch. 21 - Prob. 37P Ch. 21 - Prob. 38P Ch. 21 - Consider the circuit shown in Figure P21.39. Find...Ch. 21 - Four resistors are connected to a battery as shown...Ch. 21 - Three 100- resistors are connected as shown in...Ch. 21 - Prob. 42P Ch. 21 - Calculate the power delivered to each resistor in...Ch. 21 - Prob. 44P Ch. 21 - The ammeter shown in Figure P21.45 reads 2.00 A....Ch. 21 - Prob. 46P Ch. 21 - The circuit shown in Figure P21.47 is connected...Ch. 21 - In Figure P21.47, show how to add just enough...Ch. 21 - Taking R = 1.00 k and = 250 V in Figure P21.49,...Ch. 21 - For the circuit shown in Figure P21.50, we wish to...Ch. 21 - In the circuit of Figure P21.51, determine (a) the...Ch. 21 - Jumper cables are connected from a fresh battery...Ch. 21 - Prob. 53P Ch. 21 - Prob. 54P Ch. 21 - Prob. 55P Ch. 21 - Prob. 56P Ch. 21 - In the circuit of Figure P21.57, the switch S has...Ch. 21 - Prob. 58P Ch. 21 - The circuit in Figure P21.59 has been connected...Ch. 21 - Assume that global lightning on the Earth...Ch. 21 - Prob. 61P Ch. 21 - Prob. 62P Ch. 21 - Prob. 63P Ch. 21 - Prob. 64P Ch. 21 - Prob. 65P Ch. 21 - An oceanographer is studying how the ion...Ch. 21 - The values of the components in a simple series RC...Ch. 21 - Prob. 68P Ch. 21 - Prob. 69P Ch. 21 - Prob. 70P Ch. 21 - The student engineer of a campus radio station...Ch. 21 - Prob. 72P Ch. 21 - A battery has an emf and internal resistance r. A...Ch. 21 - Prob. 74P Ch. 21 - Prob. 75P Ch. 21 - Prob. 76P Ch. 21 - Prob. 77P

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