HW03 - Physics 201 Homework Set 03 CHAPTER 25 Electric...

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Physics 201 Homework Set 03 CHAPTER 25: Electric Currents and Resistance 25[9, 11, 25, 33, 34, 45, 49, 55, 63] 1 25–2 and 25–3 Electric Current, Resistance, Ohm’s Law 9. (II) A 12-V battery causes a current of 0.60 A through a resistor. ( a ) What is its resistance, and ( b ) how many joules of energy does the battery lose in a minute? 25–4 Resistivity 11. (I) What is the diameter of a 1.00-m length of tungsten wire whose resistance is 0.32 Ω 25. (II) A length of wire is cut in half and the two lengths are wrapped together side by side to make a thicker wire. How does the resistance of this new combination compare to the resistance of the original wire? 25–5 and 25–6 Electric Power 33. (I) What is the maximum voltage that can be applied across a 3.3-k Ω resistor rated at 1 4 watt? 34. (I) ( a ) Determine the resistance of, and current through, a 75-W lightbulb connected to its proper
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Unformatted text preview: source voltage of 110 V. ( b ) Repeat for a 440-W bulb. 45. (II) A power station delivers 750 kW of power at 12,000 V to a factory through wires with total resistance 3.0 Ω. How much less power is wasted if the electricity is delivered at 50,000V rather than 12,000 V? 25–7 Alternating Current 49. (I) Calculate the peak current in a 2.7-k Ω resistor connected to a 220-V rms ac source. 55. (II) A heater coil connected to a rms 240-V ac line has a resistance of 44 Ω ( a ) What is the average power used? ( b ) What are the maximum and minimum values of the instantaneous power? General Problems 63. A person accidentally leaves a car with the lights on. If each of the two headlights uses 40 W and each of the two taillights 6 W, for a total of 92 W, how long will a fresh 12-V battery last if it is rated at 85A-h? Assume the full 12 V appears across each bulb....
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