- A 100 W lightbulb has a resistance of about 12 when cold (20 deg * C) and 156 when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity a = 0.0045(C) ^ - 1.
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- . A 100 W tungsten filament light bulb functions by taking advantage ofresistive losses in the filament, absorbing 100 joules each second of energyfrom the wall socket. How much optical energy per second do you expect it toproduce, and does this violate the principle of energy conservation?Alfredo deDarke sleeps with a 7.5-Watt night light bulb on. He turns it on before getting in bed and turns it off 8 hours later. Determine the amount of energy used during one evening in units of kiloWatt•hours. Electrical energy costs 9.7027 pesos per kh-hr where Alfredo lives. Determine the annual (365 days) cost of this practice of using a 7.5-Watt night light. Determine the annual savings if Alfredo replaced his 7.5-Watt incandescent night light by a 0.5-Watt LED night light.What will be the number of lamp each having 300 lumens required to obtain an average illumination of 50 lux on a 4m*3m rectangular room.
- A 40 W fluorescent lamp produces 3,200 lumens of light on a room having general dimensions of 8 ft x 6 ft. Determine the illumination, in foot-candles on the floor. Show detailed solution. No solution. No points.A traditional light bulb has an electrical power of 40 W (round, d = 50 mm). The surface of an incandescent lamp is about 127 °C, while the surrounding air is 27 °C. What percentage of the power is lost through natural convection?The tungsten filament in an incandescent lamp has a resistance of 9.8 ohms at aroom temperature of 200C and resistance of 132 ohms at normal operatingtemperature. Calculate the temperature of the heated filament. (α20 0C = 0.0045).
- Calculate the current of the circuit (i.e., the current leaving from the point a Voltage is 229/9It is desired to apply direct lighting by hanging a fluorescent luminaire with a luminous flux of 2100 lm 1x40 W 50 cm below the ceiling of a room with dimensions of 6x3 m and a height of 3 m. Working table height is 75 cm and 100 lux light intensity is required in the room. The ceiling and walls are white and the floor is concrete. Find the required number of luminaires.Luminaire lamp with power (80 w) working at voltage (220 V) working temperature° Fuse to (1500 m(If the coefficient of thermal resistance of the wick)5*10^-3 (for each scorepercentage. Calculate the current passing through the lamp as soon as it is lit if its temperatureElementary ° (20 ° C.
- Suppose that each headlight of your car uses 3A and that you accidentally left the headlights on. How long will it take for a 12 V battery rated 80A – hr to be fully dischargedThe illumination of a drawing office 30 m x 10 m is to have a value of 250 lux and is to be provided by a number of 300 W lamps, each lamp having an output of 14 lumens per watt. CU = 0.40, MF = 0.90. Determine the number of lamps of required. Show detailed solution. No solution. No points.Calculate the electric and magnetic fields produced by the radiation coming from 200W bulb at a distance of 5m. Assume that the efficiency of the bulb is 5 % and it is a point source.