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Light bulbs are rated by their power consumption in watts (W). Electricity is sold in units of energy, which is power multiplied by time. Electricity costs vary widely across the united states and are on the order of 0.06-0.23$/kw-hr for residential customers. Create a spreadsheet that utilizes electricity costs and the number of hours per day that a light bulbs is on as input variables. Then calculate the annual cost to operate a 60-W, 75-W, and 100-W incandescent bulb and a 15-W compact fluorescent bulb. Assuming the average household operates six 60-W, four 75-W, and two 100-W incandescent bulbs for 6 hours a dday. how much money can they save in year by changing all the bulbs to compact fluorescent?
determine the minimum mass in kg of a 24 in long tension member that must support a load of 1000 lbs manufactured from
a 250ft square shell and tube heat exchanger was purchased for 13500 in 1994 when the index value was 830. estimate the
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they are using temperature and that is throwing me off. my books examples use watts for the high and low temp sources
an automobile battery is modeled as a 12v ideal voltage source in series with a 0.3 ohm internal resistance. it is to
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he vapor compression heat pump operates at steady state using refrigerant 22 whose flow rate is 6kgmin. the heat pump
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three shopping carts are initially stationary on a slope the friction in the wheels allowing them to stay still. a
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