Homework Answers
In e) part, "cost of each kWH" should be correct. Cost is for
energy not power.
The filament of a 75-W light bulb is at a temperature of 3,650 K. Assuming the...
The filament of a 75-W light bulb is at a temperature of 3,650 K. Assuming the filament has an emissivity e = 0.6, find its surface area.
Please fully explain 6) A particular light bulb is rated at 75 Watts when a voltage...
Please fully explain
6) A particular light bulb is rated at 75 Watts when a voltage of 110 volts is placed across it. a) What is the electric current through the light bulb in this circumstance? b) What is the resistance of the light bulb? light bulb, should the resistance of the light bulb be lowered or raised from that in part b above if 0.682 A 1612 c) In designing a new wattage the power of the light bulb...
The filament of a light bulb is cylindrical with length 1 = 20 mm and radius...
The filament of a light bulb is cylindrical with length 1 = 20 mm and radius r = 0.05 mm. The filament is maintained at a temperature T = 5000 K by an electric current. The filament behaves approximately as a black body, emitting radiation isotropically. At night, you observe the light bulb from a distance D = 10 km with the pupil of your eye fully dilated to a radius r = 3 mm. (a) What is the total...
1. The filament of a standard 100-W light bulb has a resistance of about 100 ohms....
1. The filament of a standard 100-W light bulb has a resistance of about 100 ohms. For this laboratory the glass of the light bulb is unfrosted, so that the filament can be viewed directly. The light bulb is connected to a variable AC voltage source (a Variac), which can deliver up to 140 volts AC. When the voltage is low, about 20 volts, the filament is a dull, red color. When the voltage is high, 100 V, how does...
Light bulb A is marked "25 W 120 V" and light bulb B "100 W 120...
Light bulb A is marked "25 W 120 V" and light bulb B "100 W 120 V"; this means that each bulb converts its respective power when plugged into a constant 120 V source, Find the resistance of each bulb, How long does it take for 1.00 C to pass into bulb A? Is this charge different in any way upon its exit from the bulb versus it entry? Explain, How long does it take for 1.00 J to pass...
(a) How much current flows in a 100 watt bulb when lit? Assume 120 volts and...
(a) How much current flows in a 100 watt bulb when lit? Assume 120 volts and assume DC voltage. (b) What is the resistance of a 100 watt light bulb when lit? Assume 120 volts and a tungsten filament temperature of 1200° C when lit. (c) How much current flow in the bulb when it is first turned on and the temperature of the filament is 20° C? Use α-5.36 x 10-3 Co.1 for tungsten.
6. A 75 W light bulb operates at a potential difference of 95 V. a. What...
6. A 75 W light bulb operates at a potential difference of 95 V. a. What is the current in the bulb? b. What is the resistance of the bulb? C. If the bulb is replaced by a bulb with half of the resistance found in part b, what is its power rating when operated at the same potential?
A 75 W light bulb is used for 9 hours a day. The electricity for this...
A 75 W light bulb is used for 9 hours a day. The electricity for this bulb comes from a natural gas fired power plant that operates with 46% efficiency. How much CO2 is emitted per day to power this light bulb? Make a simple estimate of the CO2 emissions from the power plant, ignoring transmission losses.
A 75.0 W light bulb is plugged into a 120 V outlet. What is the resistance...
A 75.0 W light bulb is plugged into a 120 V outlet. What is the resistance of the bulb’s filament?
Review Con: Part A An incandescent light bulb uses a coiled filament of tungsten that is...
Review Con: Part A An incandescent light bulb uses a coiled filament of tungsten that is 580 mm long with a diameter of 46.0 um. At 20.0°C tungsten has a resistivity of 5.25 x 1012.m. Its temperature coefficient of resistivity is 0.0045 (Cº) , and this remains accurate even at high temperatures. The temperature of the filament increases linearly with current, from 20°C when no current flows to 2520°C at 1.00 A of current What is the resistance of the...
Please fully explain
6) A particular light bulb is rated at 75 Watts when a voltage of 110 volts is placed across it. a) What is the electric current through the light bulb in this circumstance? b) What is the resistance of the light bulb? light bulb, should the resistance of the light bulb be lowered or raised from that in part b above if 0.682 A 1612 c) In designing a new wattage the power of the light bulb...
The filament of a light bulb is cylindrical with length 1 = 20 mm and radius r = 0.05 mm. The filament is maintained at a temperature T = 5000 K by an electric current. The filament behaves approximately as a black body, emitting radiation isotropically. At night, you observe the light bulb from a distance D = 10 km with the pupil of your eye fully dilated to a radius r = 3 mm. (a) What is the total...
1. The filament of a standard 100-W light bulb has a resistance of about 100 ohms. For this laboratory the glass of the light bulb is unfrosted, so that the filament can be viewed directly. The light bulb is connected to a variable AC voltage source (a Variac), which can deliver up to 140 volts AC. When the voltage is low, about 20 volts, the filament is a dull, red color. When the voltage is high, 100 V, how does...
Light bulb A is marked "25 W 120 V" and light bulb B "100 W 120 V"; this means that each bulb converts its respective power when plugged into a constant 120 V source, Find the resistance of each bulb, How long does it take for 1.00 C to pass into bulb A? Is this charge different in any way upon its exit from the bulb versus it entry? Explain, How long does it take for 1.00 J to pass...
(a) How much current flows in a 100 watt bulb when lit? Assume 120 volts and assume DC voltage. (b) What is the resistance of a 100 watt light bulb when lit? Assume 120 volts and a tungsten filament temperature of 1200° C when lit. (c) How much current flow in the bulb when it is first turned on and the temperature of the filament is 20° C? Use α-5.36 x 10-3 Co.1 for tungsten.
6. A 75 W light bulb operates at a potential difference of 95 V. a. What is the current in the bulb? b. What is the resistance of the bulb? C. If the bulb is replaced by a bulb with half of the resistance found in part b, what is its power rating when operated at the same potential?
Review Con: Part A An incandescent light bulb uses a coiled filament of tungsten that is 580 mm long with a diameter of 46.0 um. At 20.0°C tungsten has a resistivity of 5.25 x 1012.m. Its temperature coefficient of resistivity is 0.0045 (Cº) , and this remains accurate even at high temperatures. The temperature of the filament increases linearly with current, from 20°C when no current flows to 2520°C at 1.00 A of current What is the resistance of the...
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