EP PHYSICS F/SCI.+ENG.W/MOD..-MOD.MAST.
5th Edition
ISBN: 9780134402635
Author: GIANCOLI
Publisher: PEARSON CO
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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.
(II) (a) What is the current in the element of an electric clothes dryer with a resistance of
8.6 8 when it is connected to 240 V? (b) How much charge passes through the element in 50 min? (Assume direct current.)
(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-
perature of the filament when hot assuming an average
temperature coefficient of resistivity a = 0.0045 (C°)-1.
Chapter 25 Solutions
EP PHYSICS F/SCI.+ENG.W/MOD..-MOD.MAST.
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) What is the total amount of energy stored in a 12-V, 65 A.Hcar battery when it is fully charged?arrow_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(III) A length of aluminum wire is connected to a precision10.00-V power supply, and a current of 0.4212 A is preciselymeasured at 23.5°C. The wire is placed in a new environmentof unknown temperature where the measured current is0.3818 A. What is the unknown temperature?arrow_forward
- (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) How much would you have to raise the temperature ofa copper wire (originally at 20°C) to increase its resistanceby 12%?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(II) How many kWh of energy does a 550-W toaster use inthe morning if it is in operation for a total of 5.0 min? At acost of 9.0 cents/ kWh estimate how much this would addto your monthly electric energy bill if you made toast fourmornings per week.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
- (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(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
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