Examples of kilowatt-hour in the following topics:
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- To calculate the amount of money a motor will consume (in electricity) over its lifetime, it is first necessary to find out the local cost of electricity per kilowatt-hour.
- Let's assume that electricity costs are $0.05 per kilowatt-hour, the motor in question will run 24 hours a day, seven days a week at full load, and that it's rated as 94% efficient.
- (100 horsepower × .746 kW/hp × 40,000 hours × $.05 kW-hour)/ .94 efficiency = $158,723 electricity costs
- If electricity costs $0.05 per kilowatt-hour, multiply the first sum by $50 to obtain the overall electricity costs of the motor in question.
- Assuming that electricity cost five cents per kilowatt-hour, multiply 400 by $50.
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- However, typically, residential energy bills state household energy consumption in kilowatt-hours (kWh).
- We can parse out the conversion from kilowatt-hours to joules in this way: 1 W = 1 J/s and a kilowatt is 1000 W while one hour is 3,600 seconds, so 1 kWh is (1000 J/s)(3600 s)=3,600,000 joules.
- This is the scale of American home energy usage, which is on the order of hundreds of kilowatt-hours per month.
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- At the plant level, common input statistics are monetary units, weights or volumes of raw or semi-finished materials, kilowatt hours of power, and worker hours.
- These are tracked as sets of partial productivity, such as kilowatt-hours per ton or yield (weight of output divided by weight of input), both of which are used in the chemical, refining, wood pulp, and other process industries.
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- Even with electricity rates as low as four cents per kilowatt-hour, most 20 horsepower motors (running continuously) use up to $6,000 worth of electricity annually.
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- Water and wastewater pumps consume over 50 billion kilowatt-hours of electricity in the USA every year (about $4 billion worth of power) and most of the energy they consume is used to fight against the friction created when water is forced through narrow pipes, around bends and up steep inclines.
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- Every ton of recycled paper also saves 4,000 kilowatt-hours of electricity, 26,497 litres of water, and 17 trees (each of which has the capacity to filter 27 kilos of pollutants from the air).
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- Imagine also that the company needs 1,000 kilowatt-hours of electricity per month to run its operations.
- If the business wants to become energy-self-sufficient, this means that it will have to purchase enough solar voltaics, wind turbines or fuel cells to produce 1,000 kilowatt-hours of electricity every month.
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- For example, the Mauna Lani Bay Hotel on the Kona-Kohala coast of Hawaii turned its premises into a 100 kilowatt power station by retiling its roof with solar cells.
- In Aberdeen, Scotland, the Cults Primary School set up a 5 kilowatt wind turbine in May of 2007 that not only reduced its electricity bill, but also cut its annual carbon emissions by 5,633 kilos.
- The 4,924 m2 elementary school in Spirit Lake, Iowa, for example, installed a 250 kilowatt wind turbine that provides an average of 350,000 kilowatt-hours of electricity per year.
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- What mass of copper will be deposited if a current of 0.22 amp flows through the cell for 1.5 hours?
- $1.5\ hours \times \frac {3600\ seconds}{1\ hour} \times \frac {.22\ Coulombs}{second} \times \frac {1\ mole\ e^-}{96485\ Coulombs} \times \frac {1\ mole\ Cu^{2+}}{2\ mole\ e^-} \times \frac {63.54\ grams\ Cu}{1\ mole\ Cu} =$
- How many amps would it take to deposit 0.39 grams of Cu in 1.5 hours?
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- Points were generated for reducing kilowatt-hours of electricity, saving amounts of raw materials, reducing production minutes, and so on.