Time to boil a water kettle

In summary, the question asked was how many minutes it would take to boil a big kettle (twice the amount of water) using the same electric coil that takes A minutes to boil a small kettle. The answer is 2A, assuming the kettle is made of the same metal and no heat is lost to the surrounding environment. It was suggested that this question would be more appropriate in a general physics forum.
  • #1
pixel01
688
1
My friend asks me this question, I have not worked it out.
I hope it is suitable to maths box .

The time to boil a small kettle of water using a electric coil is A minutes.
Q: How many minutes needed to boil a big kettle (two times the mass of water compared to the small kettle), if using the same coil. Consider no heat is transmitted away to the ambient.
 
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  • #2
It is 2A
 
  • #3
Is it the same metal kettle the entire time?

If so, then the answer is 2A.

Also, this would be a better fit in the general physics forum than in general math.
 

1. How long does it take for a water kettle to boil?

The time it takes for a water kettle to boil depends on various factors such as the power of the kettle, the amount of water in the kettle, and the starting temperature of the water. On average, it takes about 3-4 minutes for a standard electric kettle to boil a full pot of water.

2. Why does it take longer for a kettle to boil if there is more water in it?

The more water there is in a kettle, the longer it will take to boil. This is because it takes more energy to heat a larger amount of water. Additionally, the surface area of the water in the kettle increases as the water level rises, which means more heat is lost to the surrounding air.

3. Why does it take longer for a kettle to boil at higher altitudes?

At higher altitudes, the air pressure is lower. This means that water boils at a lower temperature, which in turn requires more time to reach the boiling point. As a result, it takes longer for a kettle to boil water at higher altitudes compared to sea level.

4. Is it more energy-efficient to boil a full kettle of water or just the amount needed?

It is more energy-efficient to boil only the amount of water needed. Boiling a full kettle of water every time will consume more energy and take longer to boil. It is recommended to only boil the amount of water needed to save energy and time.

5. Can the type of water affect the boiling time in a kettle?

Yes, the type of water can affect the time it takes for a kettle to boil. Hard water, which contains minerals such as calcium and magnesium, can take longer to boil compared to soft water. This is because the minerals in hard water can create a layer on the heating element, reducing its efficiency.

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