How to save electricity?
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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. -
Nebbermind:
I believe there will be difference in the energy needed...but probably too insignificant and we should not be fighting over it here.
no no
I m not fighting over dis.
Just trying to clarify a difference of opinion here.
It wld actually be gud for everyone's understanding if someone who has 2 different sized electric kettles test it out.
Yes, my view is d difference is likely insignificant in $ sense. -
Way2GO:
Huh? Wat constant u talking - d same amount of energy expended in heating up d same quantity of water?
YES
The totally amount of energy required to bring the water to boiling is dependent on the amount of water, NOT the rate of power delivery (power rating). (Assuming no energy losses to surroundings etc..).
Just ask any O level kid.
Or maybe some secondary teachers around can answer that question. -
limlim:
:faint:
Please READ carefully before you jump to conclusion and reply.
OK u win.
I old flower eyes.
Peterch, u also old flower eyes? :evil: -
Way2GO:
No disagreement with that.
Yes, my view is d difference is likely insignificant in $ sense.
But since someone asked.. no harm answering. -
Peace! Peace! Just thinking out aloud….
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the amount of heat loss during the boiling process of the same amount of water at the same starting temperature may be different due to the different kettle size / surface area and power rating as has been explained in the few posts above.
notwithstanding the heat loss to be quantified that caused some differences in energy consumed, it also generated some heat among the different forumers in the above few posts...this heat generated is hard to quantify..... :evil: :evil:
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