On an electric heater 220 volt and 1100 watt are marked. On using it for 4 hours, the energy consumed in kWh will be

Options

A. 2
B. `4.4`
C. 6
D. 8

Answer

To solve the problem of calculating the energy consumed by an electric heater rated at 220 volts and 1100 watts when used for 4 hours, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Power Rating**:
The power rating of the electric heater is given as 1100 watts (W).

2. **Convert Time to Hours**:
The time for which the heater is used is given as 4 hours.

3. **Calculate Energy Consumed**:
The energy consumed (in watt-hours) can be calculated using the formula:
\[ \text{Energy (in watt-hours)} = \text{Power (in watts)} \times \text{Time (in hours)} \]
Substituting the known values:
\[ \text{Energy} = 1100 \, \text{W} \times 4 \, \text{h} = 4400 \, \text{Wh} \]

4. **Convert to Kilowatt-Hours**:
Since we need the energy in kilowatt-hours (kWh), we convert watt-hours to kilowatt-hours by dividing by 1000:
\[ \text{Energy (in kWh)} = \frac{4400 \, \text{Wh}}{1000} = 4.4 \, \text{kWh} \]

### Final Answer:
The energy consumed by the electric heater when used for 4 hours is **4.4 kWh**.

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