Kilowathour is the unit of

Options

A. A. Energy
B. B. Power
C. C. Charge
D. D. Time

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Kilowatt Hour":**
- A kilowatt hour (kWh) is a unit of measurement that represents the amount of energy consumed or produced over a period of one hour at a power level of one kilowatt.

2. **Breaking Down the Components:**
- The term "kilowatt" refers to a power level of 1,000 watts.
- The term "hour" refers to the duration of time, specifically one hour.

3. **Calculating Energy:**
- Energy can be calculated using the formula:
\[ \text{Energy (in kWh)} = \text{Power (in kW)} \times \text{Time (in hours)} \]
- Therefore, if a device operates at 1 kW for 1 hour, it consumes 1 kWh of energy.

4. **Conversion to Other Units:**
- 1 kilowatt hour is equivalent to 3.6 million joules (3.6 MJ) or 3600 kilojoules (kJ).
- This conversion is important for understanding how kWh relates to other energy units.

5. **Application in Real Life:**
- The kilowatt hour is commonly used by electric utilities to bill consumers for the energy they use. It quantifies the total energy consumed over time.

6. **Conclusion:**
- Based on the definition and calculations, we conclude that a kilowatt hour is a unit of energy.

### Final Answer:
- Kilowatt hour (kWh) is a unit of **energy**.