If a bulb uses energy of 100 J and remains for 20 seconds , then the power consumed by the bulb is :

Options

A. 20 W
B. 0.2 W
C. 1 W
D. 5 W

Answer

To find the power consumed by the bulb, we can use the formula for power, which is defined as the amount of energy consumed per unit time. The formula is:

\[ \text{Power} (P) = \frac{\text{Energy} (E)}{\text{Time} (t)} \]

### Step-by-Step Solution:

1. **Identify the given values**:
- Energy (E) = 100 Joules
- Time (t) = 20 seconds

2. **Substitute the values into the power formula**:
\[ P = \frac{E}{t} = \frac{100 \text{ J}}{20 \text{ s}} \]

3. **Perform the division**:
\[ P = \frac{100}{20} = 5 \text{ Watts} \]

4. **State the unit of power**:
- The unit of power is Watts (W).

5. **Final answer**:
- The power consumed by the bulb is **5 Watts**.