Modified Mastering Physics with Pearson eText -- Combo Access -- for Physics for Scientist and Engineers (18 week)
5th Edition
ISBN: 9780137504299
Author: Douglas C. Giancoli
Publisher: Pearson Education (US)
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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 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) 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.]
Chapter 25 Solutions
Modified Mastering Physics with Pearson eText -- Combo Access -- for Physics for Scientist and Engineers (18 week)
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) 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.)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) 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
- (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(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) What is the resistance of a 240 V, 5600 W electric heater?arrow_forward
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