The solar power per unit area at the Earth's distance from the sun--called the "solar constant"--is 1.36 kW/m^2. If a solar power station in a sunny location uses 20%-efficient solar panels, what area of panels is required to replace a 1.0 GW power plant at noon. Express the answer in square kilometers. 3676
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- An electric water heater consumes 4.88 kW for 3.85 h per day. What is the cost (in dollars per year) of running it for one year if electricity costs 14.6 cents/(kW · h)?A clothes dryer uses 3000 W and is run fro 1 hour. If the total useful energy to dry the clothes is 1.7 X 10 to the power of 5 J, what is the efficiency of the dryer?On a particular day, the following appliances are used for the times indicated: a 1600-W coffee maker, 19 min, and a 1100-W microwave oven, 3.2 min. With these power requirements, find how much it costs to use these appliances at an electrical cost of 9¢ per kWh.
- What is the average power consumption in watts of an appliance that uses 6.62 kW · h of energy per day? How many joules of energy does this appliance consume in a year?A book on a shelf has potential energy of 200J and two times the mass of a book next to it. What is the GPE of the smaller book?If a certain brand of solar panels is rated at a value of 1.50 KW/m2, and a person needed to generate2.50 MJ in an hour, what area of this type of solar panel would be needed?
- A 40 Watts bulb is used for 12.5 hours everyday for 30 days. Calculate the consumption of electrical energy.If a hair dryer is rated at 1750 W, how much energy does it require in 6 minutes?A microwave oven has a power requirement of 1,243 W. A frozen dinner requires 5.6 min to heat on full power. (a) How much electrical energy (in kWh) is used?
- A family of five is planning to install solar panels on the roof of their home to help reduce the cost of electricity and save energy to help the environment. The family plans to install 10 panels, each with a power rating 600W. On average, a solar panel can produce electricityfor 4.5 hours daily. How much solar energy will the solar panels transform into electrical energy each day?On a particular day, the following appliances are used for the times indicated: a 1600-W coffee maker, 19 min, and a 1100-W microwave oven, 4.6 min. With these power requirements, find how much it costs to use these appliances at an electrical cost of 7¢ per kWh. (Do not round your final answer. Fractional cent values are acceptable.)Ace Industries has a 50 kW air compressor that operates at full-load (LF = 1), all day for 365 days per year. the motor for the air compressor cost €1400, the motor efficiency is 90%, and electricity costs €7.00/kW/month and €0.10/kWh, how much does it cost to operate the air compressor for one year?