Question

The SI unit of power is: 

• A. Watt
• B. Joule
• C. Newton
• D. Pascal Correct Answer: (A) Watt Solution:

Hint:

Remember these common SI units: \[ \text{Work} \rightarrow \text{Joule} \] \[ \text{Power} \rightarrow \text{Watt} \] \[ \text{Force} \rightarrow \text{Newton} \] \[ \text{Pressure} \rightarrow \text{Pascal} \]

Answer 1

The Correct Option is A

Concept: Power is defined as the rate at which work is done or energy is transferred. Mathematically, \[ P=\frac{W}{t} \] where

• \(P\) = Power

• \(W\) = Work done

• \(t\) = Time taken
The SI unit of work is Joule (J) and the SI unit of time is second (s). Therefore, \[ \text{SI unit of Power} = \frac{\text{Joule}}{\text{second}} \] This unit is called the

Watt.

Step 1: Recall the definition of power. Power measures how quickly work is performed. A machine doing the same amount of work in less time has greater power.

Step 2: Determine the SI unit. Since \[ 1\;W = 1\;\frac{J}{s} \] the SI unit of power is Watt.

Step 3: Check the remaining options.

• Joule is the SI unit of work and energy.

• Newton is the SI unit of force.

• Pascal is the SI unit of pressure.
Thus, only Watt represents power. \[ \boxed{\text{SI unit of Power = Watt}} \] Hence, the correct option is \(\boxed{(A)}\).