Just while were here, I have always wondered about electric kettles. Are they efficient? I mean, energy is usually wasted as heat, but the device is trying to produce heat so surely there is little "waste". The same applies to electric fires etc I guess, probably moreso. I can see that energy is lost in transfer to the water, but the heater itself (do heating elements light up inside like toaster wires?).
I think that stepup transform produce 100% efficiency its not a silly question though.... if you provide an input of 12 volts and try to get 220 volts stepup output... then according to Efficiency=Vout/ Vin x 100= 220/12= 100%
Now what to say??
I think that stepup transform produce 100% efficiency its not a silly question though.... if you provide an input of 12 volts and try to get 220 volts stepup output... then according to Efficiency=Vout/ Vin x 100= 220/12= 100%
Now what to say??
I say 220/12*100=1833%. Now what to say?
Efficiency, from a simplistic standpoint, is (power out)/(power in). You have neglected current in your equation.
If you already have all the answers, and have developed a perpetual motion machine in contradiction to the well known 2nd Law of Thermodyanics, why on Earth would you waste your time on this forum.
I think that stepup transform produce 100% efficiency its not a silly question though.... if you provide an input of 12 volts and try to get 220 volts stepup output... then according to Efficiency=Vout/ Vin x 100= 220/12= 100%
Now what to say??
I say your figures are completely wrong (and make no sense), 100% is PERFECTION, and nothing is perfect - which is why it's a silly question!. There will always be losses in whatever you do!.
Just while were here, I have always wondered about electric kettles. Are they efficient? I mean, energy is usually wasted as heat, but the device is trying to produce heat so surely there is little "waste". The same applies to electric fires etc I guess, probably moreso. I can see that energy is lost in transfer to the water, but the heater itself (do heating elements light up inside like toaster wires?).
sure.. we can contruct a kettle to have high efficiency , but not 100% -> which comes when the power o/p (used) == Input Power.
In case of kettle, losses are in form of conduction/convection/radiation
I would like to thanks all of you to participate on this silly discussion.... but its not silly in a way.... Nothing is perfect i believe that transformers cannot be the perfect device , they are not efficient as 80% ... as they have core lossses, winding and tap losses.... But the figures disagree with me....
I would like to thanks all of you to participate on this silly discussion.... but its not silly in a way.... Nothing is perfect i believe that transformers cannot be the perfect device , they are not efficient as 80% ... as they have core lossses, winding and tap losses.... But the figures disagree with me....
I was told transformers are the most efficient things made by people. And then for some reason the number 98% floats in my head. Of course, this was during high-school...and you never know the accuracy of their claims. I don't know if it's 90% or 95% or 98%. Never bothered to follow up...
Depends on the transformer, a small 1VA transformer might only be 40% efficient, while a 10VA unit might give you 80% and a 1MVA 99%. Generally bigger transformers are more efficient than smaller ones and the same goes for motors.
Not if it's a really big transformer, using 500kW to supercool a 1GVA transformer is probably worth it, I've never heard of a transformer this big before though.
Not if it's a really big transformer, using 500kW to supercool a 1GVA transformer is probably worth it, I've never heard of a transformer this big before though.
That's assuming it would 'only' take 500kW to super cool it?, I suspect (in fact I'm absolutely positive!) you've got no more idea than me what it would take to supercool such a theoretical transformer