PHYSICS F/SCI.+ENGR.,CHAPTERS 1-37
5th Edition
ISBN: 9780134378060
Author: GIANCOLI
Publisher: RENT PEARS
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(II) Calculate the ratio of the resistance of 10.0 m of aluminum wire 2.2 mm in diameter, to 24.0 m of copper wire 1.8 mm in diameter.
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perature of the filament when hot assuming an average
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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) You buy a 75-W lightbulb in Europe, where electricityis delivered at 240 V. If you use the bulb in the United Statesat 120 V (assume its resistance does not change), how brightwill it be relative to 75-W 120-V bulbs? [Hint: Assumeroughly that brightness is proportional to power consumed.]arrow_forward(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?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
- (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) A 120-V fish-tank heater is rated at 130 W. Calculate(a) the current through the heater when it is operating, and(b) its resistance.arrow_forward(I) The heating element of an electric oven is designed toproduce 3.3 kW of heat when connected to a 240-V source.What must be the resistance of the element?arrow_forward
- (II) A 75-W, 120-V bulb is connected in parallel with a25-W, 120-V bulb. What is the net resistance?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(I) (a) Determine the resistance of, and current through,a 75-W lightbulb connected to its proper source voltage of110 V. (b) Repeat for a 250-W bulb.arrow_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(a) Calculate the current through a 2.5 Ω flashlight filament when connected across two 1.5V batteries. (b) Calculate the resistance of the heating elements in a toaster if a 10 A currentflows when connected across a 120 V potential difference.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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