SI unit of power is .....

Options

A. watt hour
B. kilowatt
C. watt
D. joule hour

Explanation

To find the SI unit of power, we can follow these steps:

### Step 1: Understand the definition of power
Power is defined as the rate at which work is done.

### Step 2: Write the formula for power
The formula for power (P) can be expressed as:
\[ P = \frac{W}{t} \]
where \( W \) is the work done and \( t \) is the time taken.

### Step 3: Identify the SI units of work and time
The SI unit of work is the joule (J), and the SI unit of time is the second (s).

### Step 4: Substitute the SI units into the power formula
Substituting the SI units into the formula for power gives:
\[ P = \frac{\text{joules}}{\text{seconds}} \]
This can be written as:
\[ P = \text{joule/second} \]

### Step 5: Recognize the alternative name for the unit
The unit joule per second is also known as the watt (W).

### Conclusion
Thus, the SI unit of power is the watt (W).

### Final Answer
The SI unit of power is **watt (W)**.

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