How to save electricity?
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Thank you Limlim!
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FQW:
I'm so glad I started this thread ... at least nobody throws bricks in my thread
Absolutely (glad that this thread was started)! Even more happy that we have some \"in house consultants\" like Limlim to help with the answers. -
Imami:
It is not the capacity of the kettle, but the power of the kettle used. See the label then you will find out the watt usage. So if same power with different capacity, it would be the same if you boil same volume of water.Wta- which scenario will consume more electricity:
A) to boil 500ml of water using an electric kettle which has a capacity of 1litre.
B) to boil 500ml of water using an electric kettle which has a capacity of 4litres.
Anyone? -
I concur capacity of kettle is not a factor.
d amount of power u consumed to boil d same quantity of water is only a function of d power rating times d time it takes to boil d water.
Using a higher power rated kettle would take a shorter time to boil.
My sense, without doing d actual experiments on timings, wld be d difference in power usage for 1L vs 4L kettles is not significant. -
The amount of electricity consumed is the same (wrt boiling water only and excluding the kettle) REGARDLESS of the power rating of the kettle.
High power boil the water faster. Low power boil the water slower. They used the same amount of electricity to boil the same amount of water.
Strictly speaking, a high power one could use less electricity bcoz water boil faster and less heat lost during the boiling process (if these were to be factored in).
Yes, it may not be \"significant\". Original question is whether there is a difference and which one is more. -
Way2GO:
THAT, is the same(i.e. constant) for the same amount of water to boil, REGARDLESS of the power rating.
d amount of power u consumed to boil d same quantity of water is only a function of d power rating times d time it takes to boil d water. -
limlim:
u were saying a different thing here:The amount of electricity consumed is the same (wrt boiling water only and excluding the kettle) REGARDLESS of the power rating of the kettle.
High power boil the water faster. Low power boil the water slower. They used the same amount of electricity to boil the same amount of water.
Strictly speaking, a high power one could use less electricity bcoz water boil faster and less heat lost during the boiling process (if these were to be factored in).
Yes, it may not be \"significant\". Original question is whether there is a difference and which one is more.limlim:
It is not correct to say dat d inside of kettle has to reach d same temperature as d water when it reaches boiling point - thus ur reasoning dat capacity is a factor.The bigger one, assuming similar construction (same brand etc..), coz the kettle is bigger (more mass).
To heat the water inside to boiling the inside of the container need to reach boiling temperature too. A bigger container will need more energy to reach boiling temp.
Don't believe me? Stick ur hand inside d kettle n touch any surface above d waterline after water is boiled - it is not at boiling temp.
Heat losses? Including d energy needed to heat up d kettle, for a well designed electric kettle, it's probably < 5%.
Surface area? Only d portion of d kettle in contact with d water below d waterline wld reach boiling temp. Total surface area for smaller base but higher waterline (for 1/2 L) vs bigger base with lower waterline wld therefore be d same, so heat loss in dis respect wld be d same for a well insulated kettle. -
I believe there will be difference in the energy needed…but probably too insignificant and we should not be fighting over it here.
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limlim:
Huh? Wat constant u talking - d same amount of energy expended in heating up d same quantity of water?
THAT, is the same(i.e. constant) for the same amount of water to boil, REGARDLESS of the power rating.Way2GO:
d amount of power u consumed to boil d same quantity of water is only a function of d power rating times d time it takes to boil d water.
I m only saying power consumption in kwh = power rating (in kw) x time.
Imami can calculate d power usage by timing how long it takes to boil 1/2 L of water times d power rating on d appliance,
n then compare d two readings to determine which uses more power.
Dat's d simplest way if she has both kettles, no need to go into theoretical postulations on
heat losses, surface area, latent heat, heat capacity blah blah blah :faint: -
Way2GO:
No, I am not saying a different thing. Please read carefully.
u were saying a different thing here:limlim:
The amount of electricity consumed is the same (wrt boiling water only and excluding the kettle) REGARDLESS of the power rating of the kettle.
High power boil the water faster. Low power boil the water slower. They used the same amount of electricity to boil the same amount of water.
Strictly speaking, a high power one could use less electricity bcoz water boil faster and less heat lost during the boiling process (if these were to be factored in).
Yes, it may not be \"significant\". Original question is whether there is a difference and which one is more.limlim:
It is not correct to say dat d inside of kettle has to reach d same temperature as d water when it reaches boiling point - thus ur reasoning dat capacity is a factor.The bigger one, assuming similar construction (same brand etc..), coz the kettle is bigger (more mass).
To heat the water inside to boiling the inside of the container need to reach boiling temperature too. A bigger container will need more energy to reach boiling temp.
Don't believe me? Stick ur hand inside d kettle n touch any surface above d waterline after water is boiled - it is not at boiling temp.
Heat losses? Including d energy needed to heat up d kettle, for a well designed electric kettle, it's probably < 5%.
Surface area? Only d portion of d kettle in contact with d water below d waterline wld reach boiling temp. Total surface area for smaller base but higher waterline (for 1/2 L) vs bigger base with lower waterline wld therefore be d same, so heat loss in dis respect wld be d same for a well insulated kettle.
In the 1st quote, I mentioned that it is the SAME excluding the consideration for the kettle wrt to water ONLY. In the 2nd quote (earlier post), I factored in the kettle.
Next, again, you did not read carefully. I said the INSIDE of the kettle, that is, the part which is in contact with the water, HAS to be at the same temperature of the water, NOT the whole kettle. There is bound to be some insulation within the kettle hence the outside temperature cannot be the same as INSIDE.
Please READ carefully before you jump to conclusion and reply.
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