The unit kWh represents

Options

A. power
B. momentum
C. energy
D. force

Answer

To determine what the unit kWh represents, we can break down the information step by step.

### Step-by-Step Solution:

1. **Understanding the Unit kWh**:
- The unit "kWh" stands for kilowatt-hour. It is a measure of energy.

2. **Breaking Down the Components**:
- A kilowatt (kW) is a unit of power.
- 1 kilowatt is equal to 1000 watts (1 kW = 10^3 W).
- A watt (W) is defined as one joule per second (1 W = 1 J/s).

3. **Understanding the Time Component**:
- An hour is equal to 60 minutes.
- Each minute consists of 60 seconds, so:
\[ 1 \text{ hour} = 60 \text{ minutes} \times 60 \text{ seconds/minute} = 3600 \text{ seconds} \]

4. **Calculating Energy in Joules**:
- To find out how many joules are in one kilowatt-hour, we multiply the power in watts by the time in seconds:
\[ 1 \text{ kWh} = 1000 \text{ W} \times 3600 \text{ s} = 3.6 \times 10^6 \text{ J} \]
- Therefore, 1 kWh is equal to 3.6 million joules.

5. **Identifying the Correct Option**:
- Now we can analyze the options given:
- Option 1: Power (unit: watt)
- Option 2: Momentum (unit: kg·m/s)
- Option 3: Energy (unit: joules)
- Option 4: Force (unit: newton)
- Since we established that kWh measures energy, the correct answer is **Option 3: Energy**.

### Final Answer:
The unit kWh represents **Energy**.

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