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

Step 1: Recall what power is.
Power is how fast work is done, that is work divided by time.
\[ P = \frac{W}{t} \]

Step 2: Build its unit.
Work is in joule and time is in second, so power comes out as joule per second. This unit is named the watt.
\[ 1 \text{ W} = 1 \frac{J}{s} \]

Step 3: Rule out the rest.
Joule is for energy, newton is for force and pascal is for pressure. Only watt fits power.
\[ \boxed{\text{Watt}} \]