Kilowatt hour (kWh) represents the unit of

Options

A. power
B. impulse
C. momentum
D. none of these

Answer

To determine what kilowatt hour (kWh) represents, we need to analyze the options provided: power, impulse, momentum, or none of these.

### Step-by-Step Solution:

1. **Understanding Kilowatt Hour**:
- Kilowatt hour (kWh) is a unit of energy. It is defined as the amount of energy consumed when a power of one kilowatt is used for one hour.

2. **Analyzing the Options**:
- **Power**: The unit of power is the watt (W), which is defined as joules per second (J/s). Since kilowatt hour is not a unit of power but rather a measure of energy, this option is incorrect.
- **Impulse**: Impulse is defined as the change in momentum and has the unit of Newton-seconds (Ns). Since kilowatt hour does not correspond to this unit, this option is also incorrect.
- **Momentum**: Momentum is defined as the product of mass and velocity, with the unit being kilogram meter per second (kg·m/s). Again, kilowatt hour does not match this unit, making this option incorrect as well.
- **None of These**: Since kilowatt hour does not correspond to any of the units listed in the options, this is the correct choice.

3. **Conclusion**:
- Therefore, the answer to the question is **none of these**. Kilowatt hour is a unit of energy, not power, impulse, or momentum.