One Horse Power is equal to ______ Watt. 

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NPCIL Stipendiary Trainee 2021 Official Paper-I
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  1. 746 
  2. 550 
  3. 453 
  4. 1000

Answer (Detailed Solution Below)

Option 1 : 746 
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Detailed Solution

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The correct answer is 746 Watt.

Key Points

  • One Horsepower (HP) is defined as 746 watts (W).
  • The term "horsepower" was coined by James Watt, the inventor of the steam engine, to compare the output of steam engines with the power of draft horses.
  • Horsepower is a unit of measurement of power, or the rate at which work is done, commonly used in reference to the output of engines and motors.
  • 1 HP is equivalent to lifting 550 pounds (lb) one foot (ft) in one second.

Additional Information

  • Watts:
    • A watt is a unit of power in the International System of Units (SI) equivalent to one joule per second.
    • It is used to quantify the rate of energy transfer.
  • James Watt:
    • James Watt was a Scottish inventor and mechanical engineer whose improvements to the steam engine were fundamental to the changes brought by the Industrial Revolution.
    • The unit of power "watt" was named in his honor.
  • Power Measurement:
    • Power is the rate at which work is done or energy is transferred over time.
    • Other common units of power include kilowatts (kW), megawatts (MW), and British thermal units per hour (BTU/h).
  • Engine and Motor Ratings:
    • Horsepower is commonly used to rate the power output of engines, especially in automotive and industrial contexts.
    • Electrical motors are often rated in both horsepower and watts or kilowatts.
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