PHYSICS F/SCI.+ENGINEERS W/MOD.PHYSICS
5th Edition
ISBN: 9780321992277
Author: GIANCOLI
Publisher: PEARSON
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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.)
(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.]
(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?
Chapter 25 Solutions
PHYSICS F/SCI.+ENGINEERS W/MOD.PHYSICS
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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- (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) 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) 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.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(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 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
- (III) A small immersion heater can be used in a car to heat acup of water for coffee or tea. If the heater can heat 120 mLof water from 25°C to 95°C in 8.0 min, (a) approximatelyhow much current does it draw from the car’s 12-V battery,and (b) what is its resistance? Assume the manufacturer’sclaim of 85% efficiencyarrow_forward(c) (i) In the circuit shown below, a 9 resistor and a 7.5 9 resistor are connected in parallel. The combination is connected in series with a 5 2 resistor and a 11.5 V power supply. Calculate: (A) the current in the 9 resistor; (B) the voltage drop across each resistor; and (C) the joule heating in each resistor. 11.5 V +lif 522 7.5 Ω 9Ωarrow_forward(a) Find the voltage drop in an extension cord having a 0.06 2 resistance and through which 4.5 A is flowing. V= V (b) A cheaper cord utilizes thinner wire and has a resistance of 0.35 2. What is the voltage drop in it when 4.5 A flows? V= V (c) Why is the voltage to whatever appliance is being used reduced by this amount? What is the effect on the appliance? The voltage supplied to whatever appliance is being used is reduced because the total voltage drop from the wall to the final output of the appliance is So, if the voltage drop across the extension cord is large, the voltage drop across the appliance is significantly so the power output by the appliance can be significantly reducing the ability of the appliance to work properly. Find the power dissipated in each of these extension cords: (d) an extension cord having a 0.06 resistance and through which 4.5 A is flowing; P= ✔W (e) a cheaper cord utilizing thinner wire and with a resistance of 0.35 2.; P= W (f) Which extension cord…arrow_forward
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