What is kWh ? State its value in S.I. unit.

Explanation

### Step-by-Step Solution:

1. **Definition of kWh**:
- Kilowatt hour (kWh) is a unit of energy. It represents the amount of energy consumed by a device operating at a power of 1 kilowatt for a duration of 1 hour.

2. **Understanding the components**:
- 1 kilowatt (kW) = 1000 watts (W)
- 1 hour = 3600 seconds
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