A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and 152 Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity α=0.0045(C)−1.
A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and 152...
A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and 124 Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity α=0.0045(C)−1.
A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and 128 Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity α=0.0045(C)−1.
A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and 128 Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity α=0.0045(C)−1.
Please, no referring. A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and 136 Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity α=0.0045(C)−1.
A certain lightbulb has a tungsten filament with a resistance of 19.0 Ω when at 20.0°C and 140 Ω when hot. Assume the resistivity of tungsten varies linearly with temperature even over the large temperature range involved here. Find the temperature of the hot filament.
A 60 W, 120 V lightbulb has a resistance of 12.7 ? when cold (20.0
A small bulb is rated at 7.50 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity alpha = 4.50 times 10^-3/C degree. When the filament is hot and glowing, its temperature is seven times room temperature (20 C degree). What is the resistance of the filament (in ohms) at room temperature?
5. An electric heater has a Nichrome heating element with a resistance of 9 Ω at 20°C. When l 16 V are applied, the electric current heats the Nichrome wire to 1060 C What is the operating wattage of this heater? The temperature coefficient of resistivity of Nichrome is α-0.0004 C Watts
Copper wire has a resistivity ρ = 1.7 × 10-8 Ω⋅m when at 20°C and it has a temperature coefficient α = 3.9 × 10-3 K-1. A solid cylinder of copper of length L = 85 cm and diameter D = 2.5 mm has one end held at T1 = 7°C and the other end is held at T2 = 210°C. The temperature increases linearly between the two ends of the cylinder. Given that T= T1 + ( x/L )...
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...