Question

The unit of the Power is :

• A. Nm/s
• B. Nm²/s
• C. Nm/s²
• D. Nm²/s²

Answer 1

Answer:

A. Nm/s

Unit of Power

• The SI unit of power is the Watt (W).

• It is named after the Scottish inventor James Watt, who is renowned for his contributions to the development of the steam engine.

• By definition, 1 Watt is equal to 1 Joule of energy consumed or produced per second (1 W = 1 J/s).

• Horsepower (HP): Another common unit used to measure power, particularly in engines and motors. 1 HP is approximately equal to 746 Watts.

• Kilowatt (kW): A unit often used to measure electrical power; 1 kW = 1,000 Watts.

• Kilowatt-hour (kWh): It is crucial to distinguish this from the unit of power. A Kilowatt-hour is a unit of energy, not power. It represents the energy used by a 1 kW device running for one hour (1 kWh = 3.6 x 10⁶ Joules).

• Dimension of Power: In physical dimensions, Power is expressed as [ML²T^-3].