Modified Mastering Physics With Pearson Etext -- Standalone Access Card -- For Physics For Scientists & Engineers With Modern Physics (5th Edition)
5th Edition
ISBN: 9780134402628
Author: Douglas C. Giancoli
Publisher: PEARSON
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10. (II) An electric device draws 6.50 A at 240 V. (a) If the
voltage drops by 15%, what will be the current, assuming
nothing else changes? (b) If the resistance of the device
were reduced by 15%, what current would be drawn
at 240 V?
(II) (a) What is the current in the element of an electricclothes dryer with a resistance of 8.6 Ω when it is connectedto 240 V? (b) How much charge passes through the element in 50 min? (Assume direct current.)
(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.)
Chapter 25 Solutions
Modified Mastering Physics With Pearson Etext -- Standalone Access Card -- For Physics For Scientists & Engineers With Modern Physics (5th Edition)
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) An electric device draws 5.60 A at 240 V. (a) If thevoltage drops by 15%, what will be the current, assumingnothing else changes? (b) If the resistance of the device werereduced by 15%, what current would be drawn at 240 V?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
- (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(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.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
- (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) What is the total amount of energy stored in a 12-V, 65 A.Hcar battery when it is fully charged?arrow_forward(II) An ammeter whose internal resistance is 53Ω reads5.25 mA when connected in a circuit containing a battery andtwo resistors in series whose values are 720Ω and480Ω What is the actual current when the ammeter is absent?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(b) What is the resistance of a 240 V, 5600 W electric heater?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
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