Serway_CP_poll_ch17

Serway_CP_poll_ch17 - Suppose that a voltage surge produces...

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Suppose that a voltage surge produces 140 V for a moment in a 120 V-line. What will temporarily be the output of a 100 W lightbulb assuming its resistance does not change? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 109 W 2. 118 W 3. 127 W 4. 136 W
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W/m 2 solar energy into electrical energy? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 24.0% 2. 18.0% 3. 12.0% 4. 6.0%
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of power to an electrical generator which converts 95% of this mechanical energy into electrical energy. What is the current delivered by the generator if it delivers at 3600 V? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 0.66 x 10 3 A 2. 1.0 x 10 3 A 3. 1.19 x 10 3 4. 5.9 x 10 3 A
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The heating coil of a hot water heater has a resistance of to raise the temperature of 200 kg of water from 15°C to 80 °C? (the specific heat for water = 10 3 cal/kg-°C and 1.0 cal = 4.186 J) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 1.7 hr 2. 3.8 hr 3. 5.1 hr 4. 6.9 hr
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ohm and operates at 210 V. If electrical energy costs 5.5 cents per kW-hr, what does it cost to raise the 200 kg water temperature form 15°C to 80°C? (the specific heat of water = 10 3 cal/kg°C and 1.0 cal = 4.186 J) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 48 cents 2. 83 cents 3. 16 cents 4. 80 cents
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how long does it take to dry the clothes? (Assume all heat energy goes into vaporizing water, L vap = 2.26 x 10 6 J/kg.) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 55.1 min 2. 34.2 min 3. 20.0 min 4. 15.6 min
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By what factor is the resistance of a copper wire changed when its temperature is increased from 20°C to 120°C? (the temperature coefficient of resistivity for copper = 3.9 x 10 -3 /°C) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 0.72 2. 1.06 3. 1.39 4. 1.44
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If a lamp is measured to have a resistance of 120 ohms when it operates at a power of 100 W, what is the applied voltage? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 110 V 2. 120 V 3. 125 V 4. 220 V
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If a lamp has a resistance of 120 ohms when it operates at a power of 100 W, what current does the lamp carry? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 2.10 A 2. 1.2 A 3. 0.91 A 4. 0.83 A
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An electric toaster requires 1100 W at 110 Volts. What is the resistance of the heating coil? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 7.5 W 2. 9.0 W 3. 10.0 W 4. 11.0 W
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much does it cost to operate the heater for 30 min if electrical energy costs 6 cents per kW-hr?
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Serway_CP_poll_ch17 - Suppose that a voltage surge produces...

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