An electric heater of power kW is used for 10 h.How much energy does it consume?Express your answer in (i)kWh, (ii)joule .

Explanation

To solve the problem of how much energy an electric heater of power \( k \) kW consumes when used for 10 hours, we can follow these steps:

### Step 1: Calculate Energy in kWh
The formula for energy consumed is given by:
\[ \text{Energy (kWh)} = \text{Power (kW)} \times \text{Time (h)} \]
In this case, the power of the heater is \( k \) kW and the time it is used is 10 hours. Therefore:
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