An energy quantity of one kilowatt-hour is mathematically equivalent to________________?
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Answer: C. 3600 kJ
Explanation
One kilowatt equals one thousand joules of energy delivered per second of time. A kilowatt-hour represents this power rate maintained continuously over a period of one hour. Multiplying one thousand joules per second by thirty-six hundred seconds yields thirty-six hundred kiloJoules. The SI unit of energy is the joule, which equals one watt-second of electrical work. Electrical utilities bill consumers based on total kilowatt-hours consumed over monthly billing cycles. Unit conversion factors form the foundation of thermodynamic and electrical engineering calculations.
Understanding energy unit conversions is essential for evaluating power plant generation capacities. Engineers convert kilowatt-hours to kiloJoules when analyzing thermal efficiency and heat rates. Global energy consumption statistics frequently utilize these standard electrical energy measurements. Option A is incorrect because one thousand joules equals only one watt-hour of energy. Option B underestimates the total energy by omitting the full sixty-minute time conversion factor. Option D uses incorrect dimensional units by mixing kilowatts and seconds improperly.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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