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Questions and Answers

What is the conversion of 1 kilowatthour to Btu?

  • 3,800 Btu
  • 3,412 Btu (correct)
  • 3,600 Btu
  • 4,200 Btu

How many joules are there in 1 watthour?

  • 2,400 joules
  • 3,600 joules (correct)
  • 3,500 joules
  • 2,520 joules

What is the equivalent of 1 gigawatt in kilowatts?

  • 1 million kilowatts (correct)
  • 1 billion kilowatts
  • 500 thousand kilowatts
  • 10 million kilowatts

Which conversion represents 1 horsepower in Btu per hour?

<p>2,545 Btu per hour (D)</p> Signup and view all the answers

What is the relationship between calories and Btu?

<p>1 calorie = 0.00397 Btu (D)</p> Signup and view all the answers

How many kilocalories are in 1 kilowatthour?

<p>860 kilocalories (D)</p> Signup and view all the answers

What is 1 Btu equivalent to in joules?

<p>1,055.05585 joules (A)</p> Signup and view all the answers

What does 1 dekatherm equal in Btu?

<p>1 million Btu (B)</p> Signup and view all the answers

How many megajoules are in 1 kilowatthour?

<p>3.6 megajoules (B)</p> Signup and view all the answers

What is the equivalent of 1 megawatt in kilowatts?

<p>1,000 kilowatts (A)</p> Signup and view all the answers

What is the approximate equivalent of 1 kilojoule in kilocalories?

<p>0.239 kcal (C)</p> Signup and view all the answers

Convert 1 Btu to joules.

<p>1,055.05585 joules (B)</p> Signup and view all the answers

Which of the following correctly defines a watt?

<p>Joules per second (B)</p> Signup and view all the answers

What is 1 kilowatthour equivalent to in megajoules?

<p>3.6 megajoules (B)</p> Signup and view all the answers

How many joules are equivalent to 1 terajoule?

<p>1 trillion joules (C)</p> Signup and view all the answers

What is the relationship between kilocalories and kilojoules?

<p>1 kJ = 4.1868 kcal (A)</p> Signup and view all the answers

What does 1 megawatt equal in watts?

<p>1 million watts (D)</p> Signup and view all the answers

To raise the temperature of one pound of water by one degree Fahrenheit, what amount of heat in Btu is required?

<p>1 Btu (A)</p> Signup and view all the answers

What is the approximate conversion for 1 kilowatt in horsepower?

<p>0.7457 horsepower (C)</p> Signup and view all the answers

How many gallons are in 1 barrel of crude oil?

<p>42 gallons (B)</p> Signup and view all the answers

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Study Notes

Common Prefixes and Abbreviations

  • Deka = ten, Hecto = hundred, Kilo = thousand, Mega = million, Giga = billion, Tera = trillion.

Joule Measurements and Conversions

  • Energy needed to lift one newton (about 102 g) one meter = 1 joule.
  • 1 joule = 0.0009478 Btu, and conversely, 1 Btu = 1,055.05585 joules.
  • 1 kilojoule (kJ) = 1,000 joules, which equals 0.947817 Btu.
  • 1 kilocalorie (kcal) = 4.1868 kilojoules, or 1 Btu = 1.055 kilojoules.
  • 1 kilowatt-hour (kWh) = 3.6 megajoules, while 1 megajoule = 1 million joules.

British Thermal Unit (Btu) Measurements and Conversions

  • A Btu raises one pound of water’s temperature by one degree Fahrenheit.
  • 1 Btu = 252 International Table calories, or 0.252 kilocalories.
  • 1 therm = 100,000 Btu, and 1 dekatherm = 10 therms or 1 million Btu.

Electricity Measurements and Conversions

  • 1 watt = 1 joule per second; 1 kilowatt = 1,000 watts.
  • Human climbing stairs generates about 200 watts of energy.
  • 1 kilowatthour = 3,412 Btu; 1 kilowatt = 3,412 Btu per hour.
  • 1 watthour = amount of energy used by 1 watt for one hour.
  • 1 kilowatt-hour = 3,600 joules or 3.6 kilojoules.
  • 1 megawatt (MW) = 1 million watts, while 1 terawatt (TW) = 1 trillion watts.

Power Measurements and Conversions

  • 1 Btu per second = 1.055 kilowatts, equivalent to 1.415 horsepower (electric).
  • 1 horsepower (electric) = 0.7457 kilowatts; 1 watt = 0.2388 kilocalories per second.
  • 1 kilowatthour (kWh) = 1,000 watthours; 1 gigawatthour (GWh) = 1 billion watthours.

Additional Conversions

  • 1 kiloliter = 6.2898 barrels; 1 barrel = 42 gallons.
  • 1 metric ton = 2,204.62 pounds; 1 kiloliter = 1 cubic meter.
  • 1 kilocalorie = 3.968 Btu; 1 Btu = 1.055 kilojoules.

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