COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 18, Problem 32QAP
To determine
The electrons that may pass through any given point in the wire per second.
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94 Figure 27-79 shows three 20.0 2
resistors. Find the equivalent resist-
ance between points (a) A and B, (b)
A and C, and (c) B and C. (Hint: A
Imagine that a battery is connected
between a given pair of points.)
Figure 27-79 Problem 94.
87 The circuit of Fig. 27-75 shows a
capacitor, two ideal batteries, two
resistors, and a switch S. Initially S has
been open for a long time. If it is then
closed for a long time, what is the
change in the charge on the capacitor?
Assume C = 10 µF, E, = 1.0 V, 82 = 3.0 Figure 27-75 Problem 87.
V, R = 0.20 0, and R2 = 0.40 N.
R2
Calculate how many electrons pass per second through a conductive wire connected to a 100W lamp at 127 V. Repeat calculations for a 100 W lamp at 220 V.
Chapter 18 Solutions
COLLEGE PHYSICS
Ch. 18 - Prob. 1QAPCh. 18 - Prob. 2QAPCh. 18 - Prob. 3QAPCh. 18 - Prob. 4QAPCh. 18 - Prob. 5QAPCh. 18 - Prob. 6QAPCh. 18 - Prob. 7QAPCh. 18 - Prob. 8QAPCh. 18 - Prob. 9QAPCh. 18 - Prob. 10QAP
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- Review. Ail aluminum rod has a resistance of 1.23 at 20.0C. Calculate the resistance of the rod at 120C by accounting for the changes in both the resistivity and the dimensions of the rod. The coefficient of linear expansion for aluminum is 2.40 10-6 (C)-1arrow_forwardResidential building codes typically require the use of 12-gauge copper wire (diameter 0.205 cm) for wiring receptacles. Such circuits carry currents as large as 20.0 A. If a wire of smaller diameter (with a higher gauge number) carried that much current, the wire could rise to a high temperature and cause a fire. (a) Calculate the rate at which internal energy is produced in 1.00 m of 12-gauge copper wire carrying 20.0 A. (b) Repeat the calculation for a 12-gauge aluminum wire. (c) Explain whether a 12-gauge aluminum wire would be as safe as a copper wire.arrow_forwardReview. When a straight wire is warmed, its resistance is given by R = R0,[1 + a(T T0)] according to Equation 27.20, where a is the temperature coefficient of resistivity. This expression needs to be modified if we include the change in dimensions of the wire due to thermal expansion. For a copper wire of radius 0.100 0 mm and length 2.000 m, find its resistance at 100.0C, including the effects of both thermal expansion and temperature variation of resistivity. Assume the coefficients are known to four significant figures.arrow_forward
- When a straight wire is heated, its resistance changes according to the equation R = R0 [1 + (T T0)] (Eq. 17.7), where is the temperature coefficient of resistivity. (a) Show that a more precise result, which includes the length and area of a wire change when it is heated, is R=R0[1+(TT0)][1+(TT0)][1+2(TT0)] where is the coefficient of linear expansion. (See Topic 10.) (b) Compare the two results for a 2.00-m-long copper wire of radius 0.100 mm, starting at 20.0C and heated to 100.0C.arrow_forward-4 If the magnitude of the drift velocity of free electrons in a copper wire is 8.56 x 10* m/s, what is the electric field in the conductor? V/marrow_forward9- 20F The capacitor is connected for a long time in the circuit. What is the current leaving the battery? A) 5A B) 6.25 A C) 3 A D) 4 A E) 0.67 Aarrow_forward
- Additional Problems 70 Go Each of the six real batteries in Fig. 27-68 has an emf of 20 V and a resistance of 4.0 n. (a) What is the current through the (external) resistance R = 4.0 0? (b) What is the potential difference across each battery? (c) What is the power of each battery? (d) At what rate does each battery transfer energy to internal thermal energy? Figure 27-68 Problem 70.arrow_forward61. ssm Determine the equivalent resistance between the points A and B for the group of resistors in the drawing. ww 3.0 2 4.0 2 20.0 2; 9.0 23 8.0 2 6.0 2arrow_forwardWhile a 6-µF capacitor is charged through a resistor, the current drops to half of its maximum value in 3 s. How much N is the resistor? 1.02 MQ A) 0.82 MQ B) 0.92 MQ 1.12 MQ D) 0.72 MQ E)arrow_forward
- 77. ssm Determine the voltage across the 5.0 - Q resistor in the drawing. Which end of the resistor is at the higher potential? 5.0 2 10.0 2 10.0 2 10.0 V 15.0 V 2.0 Varrow_forward3. When a potential difference of 12 V is applied to a wire 6.9 m long and 0.33 mm in diameter, the result is an electric current of 2.1 A. What is the resistivity of the wire? Chap 21_#18arrow_forward14 O In Fig. 27-32a, both batteries have emf & = 1.20 V and the external resistance R is a variable resistor. Figure 27-32b gives the electric potentials V between the terminals of each battery as func- tions of R: Curve 1 corresponds to battery 1, and curve 2 corre- sponds to battery 2. The horizontal scale is set by R, = 0.20 2. What is the internal resistance of (a) battery 1 and (b) battery 2? 0.5 -0.3 R (2) (a) (6) (A)Aarrow_forward
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