PHYSICS F/SCI.+ENGR.,CHAPTERS 1-37
5th Edition
ISBN: 9780134378060
Author: GIANCOLI
Publisher: RENT PEARS
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(II) Two aluminum wires have the same resistance. If one hastwice the length of the other, what is the ratio of the diameterof the longer wire to the diameter of the shorter wire?
(II) A 100-W lightbulb has a resistance of about 12 Q when
cold (20°C) and 140 N when on (hot). Estimate the tem-
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temperature coefficient of resistivity a = 0.0045 (C°)-1.
(II) A certain copper wire has a resistance of At 15.0 Ωwhat point along its length must the wire be cut so that the resistance of one piece is 4.0 times the resistance of the other? What is the resistance of each piece?
Chapter 25 Solutions
PHYSICS F/SCI.+ENGR.,CHAPTERS 1-37
Ch. 25.2 - If 1 million electrons per second pass a point in...Ch. 25.2 - Prob. 1BECh. 25.3 - Return to the Chapter-Opening Question, page 651,...Ch. 25.4 - Prob. 1DECh. 25.4 - Prob. 1EECh. 25.4 - Prob. 1FECh. 25.4 - How many 60-W 120-V lightbulbs can operate on a...Ch. 25.6 - Each channel of a stereo receiver is capable of an...Ch. 25 - What quantity is measured by a battery rating...Ch. 25 - When an electric cell is connected to a circuit,...
Ch. 25 - When a flashlight is operated, what is being used...Ch. 25 - One terminal of a car battery is said to be...Ch. 25 - When you turn on a water faucet, the water usually...Ch. 25 - Can a copper wire and an aluminum wire of the same...Ch. 25 - The equation P = V2/R indicates that the power...Ch. 25 - What happens when a lightbulb burns out?Ch. 25 - If the resistance of a small immersion heater (to...Ch. 25 - Prob. 10QCh. 25 - Explain why lightbulbs almost always burn out just...Ch. 25 - Which draws more current, a 100-W lightbulb or a...Ch. 25 - Electric power is transferred over large distances...Ch. 25 - A 15-A fuse blows repeatedly. Why is it dangerous...Ch. 25 - When electric lights are operated on low-frequency...Ch. 25 - Driven by ac power, the same electrons pass back...Ch. 25 - The heating element in a toaster is made of...Ch. 25 - Is current used up in a resistor? Explain.Ch. 25 - Compare the drift velocities and electric currents...Ch. 25 - A voltage V is connected across a wire of length l...Ch. 25 - Why is it more dangerous to turn on an electric...Ch. 25 - Prob. 1PCh. 25 - Prob. 2PCh. 25 - Prob. 3PCh. 25 - Prob. 4PCh. 25 - Prob. 5PCh. 25 - Prob. 6PCh. 25 - Prob. 7PCh. 25 - Prob. 8PCh. 25 - Prob. 9PCh. 25 - Prob. 10PCh. 25 - Prob. 11PCh. 25 - Prob. 12PCh. 25 - Prob. 13PCh. 25 - Prob. 14PCh. 25 - Prob. 15PCh. 25 - (II) A rectangular solid made of carbon has sides...Ch. 25 - (III) A hollow cylindrical resistor with inner...Ch. 25 - Prob. 63GP
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- (II) A 75-W, 120-V bulb is connected in parallel with a25-W, 120-V bulb. What is the net resistance?arrow_forward(II) A 120-V hair dryer has two settings: 950 W and 1450 W.(a) At which setting do you guess the resistance to be higher?After making a guess, determine the resistance at (b) thelower setting, and (c) the higher setting.arrow_forward(ii) In the circuit shown below, two batteries are connected opposing one another in the circuit. There are also, two resistors in the circuit with values of 10 Q and 7 0 respectively. Calculate the total current in the circuit. E1 = 9.5 V ľį = 1.75 R1 = 10 Q R2 = 7 2 E2 = 3.5 V r2 = 2.5 Qarrow_forward
- (II) A battery with an emf of 12.0 V shows a terminal voltageof 11.8 V when operating in a circuit with two lightbulbs,each rated at 4.0 W (at 12.0 V), which are connected inparallel. What is the battery’s internal resistance?arrow_forward(II) A 4.5-V battery is connected to a bulb whose resistanceis 1.3 Ω How many electrons leave the battery per minute?arrow_forward(III) For some applications, it is important that the valueof a resistance not change with temperature. For example,suppose you made a 3.20 Ω resistor from a carbon resistorand a Nichrome wire-wound resistor connected together sothe total resistance is the sum of their separate resistances.What value should each of these resistors have (at 0°C) sothat the combination is temperature independent?arrow_forward
- (b) If the resistor is made of carbon, what will its resistance be when its temperature is increased by 68.0 C°? (The temperature coefficient of resistivity for carbon is −5.0 10-4 (°C)-1.) Amp=1.33arrow_forward(ii) What will be the value of the voltage drop across the R3 = 80 resistor?| R1 50 R2 100 V 30 V R3 80arrow_forwardA conductor has a resistance of R. it was cut into twelve even pieces. Six of them are connected in series, six are connected in parallel. Then they are again connected in series. Find the total resistance. (10) 1arrow_forward
- (II) A rectangular solid made of carbon has sides of lengths 1.0 cm, 2.0 cm, and 4.0 cm, lying along the x, y, and z axes, respectively (Fig. 18–35). Determine the resistance for current that passes through the solid in (a) the x direc- tion, (b) the y direction, and (c) the z direction. Assume the resistivity is p = 3.0 × 10-$ :m. 2.0 cm FIGURE 18–35 1.0 cm Problem 19. 4.0 cmarrow_forward(i) A battery has an emf of 3.0 V and an internal resistance of 0.0200 Ω. What is the terminal voltage when the current drawn from the battery is 2.0 A? The terminal voltage is = (ii) If a current of 75 mA exists in a metal wire, how many electrons flow past a given cross section of the wire in 3 min? Number of electrons flow past a given cross section of the wire =arrow_forward(II) You want to design a portable electric blanket that runson a 1.5-V battery. If you use a 0.50-mm-diameter copperwire as the heating element, how long should the wire be ifyou want to generate 18 W of heating power? What happensif you accidentally connect the blanket to a 9.0-V battery?arrow_forward
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