An electric kettle, which operates at a voltage of 220V, consumes power of 4A, boils water. The efficiency of the kettle is 80%. How much water evaporates in 5 minutes?
Answers
Water evaporates in 5 minutes = 630 gm
Given:
An electric kettle, which operates at a voltage of 220V,
Consumes power of 4A.
The efficiency of the kettle is 80%.
To find:
How much water evaporates in 5 minutes.
Explanation:
Electric power = efficiency × voltage × current
Electric power = 0.8 × 220 × 4
Electric power = 704 W
Heat supplied = 704 × 60×5 = 211.2 KJ
Consider room temperature = 20°C
Specific heat of water = 4.186 KJ/KgK
Heat Required to boil the water = Heat supplied
Heat Required to boil the water = m × Specific heat of water × (100-20)
211.2 = m × 4.186 × 80
Mass water = 0.63 Kg = 630 gm
Water evaporates in 5 minutes = 630 gm
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