Question

unit commonly used to express the power of an engine
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Answer 1

Explanation:

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Answer 2

Kilowatt (kW) is the unit commonly used to express the power of an engine.

• The power of an engine is the work done by the engine in one unit of time.

      ⇒ P = WD / t

• We know that the SI unit of Work done is Joules (J) and of time is seconds (s).
• So the SI unit of power is J/s or Js⁻¹.
• The SI unit of power was adopted as Watt (W) after the renowned scientist James Watt such that 1 J/s = 1 W.
• The work done by engines is very large. So instead of watts, their power is expressed in kilowatts.
• 1000 W = 1kW