Question

The image below shows three kettles with their power ratings and the time they take to boil 500cm3 of water. How many units (kWh) does the 2.2kW kettle use to boil the water? Give your answer to 2 decimal places.

Answer 1

The number of units does the 2.2kW kettle use to boil the water is 0.13 KWh.

Given that,  

• Power = 2.2KW
• Time = 3.5 minutes

here we have to convert 3.5 minutes to hour.  

since

60 mins = 1 hour

Therefore, 3.5 mins =  0.058 hour

Now

$Power = Energy \div time$

So,  

$Energy = Power \times time$

= 2.2 (0.058)

= 0.13 KWh.

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