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How much energy would you consume daily if you kept a lightbulb of 20 watts on all day
long?
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Solved in 2 steps
- you are standing 2.5 m from a 150-W lightbulb. If the pupil of your eye is a circle 5.0 mm diameter, how much energy enters your eye per second? (assume 5.0% of the lightbulb's power is converted to light)A typical incandescent reading lamp runs at 60W. If it is lefton constantly, how much energy (J) is consumed per day,and what is the weekly cost if energy is charged at a rate of12.5 cents per kilowatthour?What is the useful energy output when a 60 W light bulb is on for 2 hours?Recall, traditional light bulbs are only 5% efficient.
- (1) An incandescent light bulb produces 5.85 Joules of light energy each second. This bulb is 7.80% efficient, meaning that only 7.80% the total energy it consumes becomes light and the rest becomes waste heat. A 12.0 W fluorescent bulb is designed to produce the same illumination (in Joules of light energy per second) as the incandescent bulb. A large building uses 17,530 light bulbs. At a cost of 8.56€/kW-hr for electricity, how much money will the owners of the building save each year if they use fluorescent bulbs instead of incandescent bulbs? Express your answer in dollars. [answer: about $828,000]An incandescent lightbulb is an inexpensive but highly inefficient device that converts electrical energy into light. It converts about 10 percent of the electrical energy it consumes into light while converting the remaining 90 percent into heat. The glass bulb of the lamp heats up very quickly as a result of absorbing all that heat and dissipating it to the surroundings by convection and radiation. Consider an 8-cm-diameter 60-W lightbulb in a room at 25°C. The emissivity of the glass is 0.9. Assuming that 10 percent of the energy passes through the glass bulb as light with negligible absorption and the rest of the energy is absorbed and dissipated by the bulb itself by natural convection and radiation, determine the equilibrium temperature of the glass bulb. Assume the interior surfaces of the room to be at room temperature.Every day a certain household uses a 3,3 kW electric stove for 72 minutes, six 6 hours each and miscellaneous appliances amounting to 1,6 kW h. The 3 kW hot w ninutes during the day. If electricity costs 35 c a kWh
- An 11 W LED light bulb has an efficiency of 30 %. What amount of energy is wasted if the bulb is operated continuously for 1 minute?A chocolate chip cookie contains about 200 kcal. how long could you power a 100-W light bulb with the energy from the cookie?Question 7: Certain areas in Arizona, Nevada, California and Texas can have up to 4000 sunny hours a year. The fact that these vast lands are less populated and agriculturally not suitable makes them ideal for solar power plants. Though most commercial solar panels have efficiencies from 15% to 20%, researchers have now developed solar cells with efficiencies approaching 50%. If you are asked to plant a solar energy system in these areas using the newest technology, how much land do you need to produce enough energy for the US. Make the conservative assumptions that the average light energy landing to the Earth' surface is 1.0 cal/(cm2 min). An estimate for the US energy consumption by major sources is given below. U.S. primary energy consumption by major sources, 1950-2019 quadrillion British thermal units 110 100 90 80 70 60 50 40 30 20 10 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 renewables nuclear petroleum natural gas coal
- A solar panel of length L and width W produces 28.4 kWh in a day. Under the same conditions (i.e. the same amount of solar energy available and the same efficiency) a solar panel of length 2L and width 2W would produce how many kWh in a day? Round off your answer to 2 decimal places, but do not write the unit.A 75 W incandescent bulb and a 15 W compact fluorescent bulb, as shown, each produce 3.0 W of visible-light energy. What are the efficiencies of these two types of bulbs for converting electric energy into light?A typical cost for electric power is $ 0.135 per kilowatt-hour. (a) Some people leave their porch lights on all the time. What is the yearly cost to keep a 75-W bulb burning day and night? (b) Suppose a refrigerator uses 400W of power when it’s running, and it runs 8 hours a day. What is the yearly cost of operating that refrigerator?