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This text reports my empirical measurements to estimate the efficiency of a portable induction hob and of an electric kettle heating water to a temperature below boiling level. A identified amount of water was heated for a hundred seconds and its temperature change was measured. The electrical energy consumed was measured using a plug-in energy meter. The figure for electrical energy is an estimate of the average, because neither the induction hob nor the kettle consumed exactly constant power. The facility studying for [Alpha Heater blog](https://story119.com/bbs/board.php?bo_table=free&wr_id=1227198) the kettle was 2.142 kW near the beginning of heating and had fallen to 2.122 kW after about 70 seconds. Normally it declined barely as heating proceeded. Power readings for the induction hob had been from 2.032 kW to 2.042 kW. Table 2 shows values calculated from these measurements, together with the general effectivity. The heat power within the water was calculated using 4.18 kJ/kg as the particular heat of water. The electrical energy was calculated by multiplying the power studying from the power meter by the time the ability was applied (a hundred seconds).
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Both the kettle and the induction hob stood unused for [Alpha Heater blog](http://deiniusoft.com:3000/maurine0475999/alpha-heater-official-site9988/wiki/Top-5-Wayfair-Battery-Power-Heaters-you-should-Consider-For-Ultimate-Comfort) hours earlier than they were used for [Alpha Heater blog](https://wiki.heycolleagues.com/index.php/This_Is_Due_To_Their_Size) this experimental heating. The induction [buy alpha heater](http://protectakorea.com/g5/bbs/board.php?bo_table=free&wr_id=11799) was used on its highest energy setting, [Alpha Heater blog](https://jessicaogechii.com/2025/10/21/transform-any-room-with-a-holmes-portable-heater-tips-and-tricks/) a nominal 2000 watts. In both circumstances after one hundred seconds, the ability was switched off. Within the case of the kettle, the water was then left for an extra 30 seconds to absorb extra heat from the kettle's base. In each instances, after this heating interval the water was poured shortly into a vacuum flask, sealed and shaken. In the case of the saucepan, a plastic funnel was used to permit sooner pouring into the flask. The flask was then re-opened to make the measurement of the water's final uniform temperature. Temperature was measured with a K-kind thermocouple. The calculated efficiency, that means the proportion of electrical energy used that was converted to heat in the water, was roughly 84% for the electric kettle and approximately 79% for [official Alpha Heater site](https://www.cbe.me.uk/19068/remi-dancing-for-you/) the portable induction hob with the enamel pan.
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Both these figures could also be below-estimates as a result of no allowance has been made for heat loss that happens in transferring the water to the flask or to the thermal capability of the flask. Of course there are additionally many different potential sources of inaccuracy together with the scales used to weigh the water, the thermometer and the electrical energy meter. No try has been made to quantify these right here. Also it could also be potential to get extra heat from the kettle by leaving the water for a distinct length of time after turning the heating aspect off. The choice of 30 seconds is arbitrary and further work could be wanted to optimise this. For the kettle, this experiment was designed to mitigate or keep away from the causes of inefficiency on this kettle highlighted in a earlier article Illustrating two causes of inefficiency in electric kettles offered in the 2020s. Here, no heat was wasted by its delayed automatic minimize-out, since the cut-out was not used. No heat was wasted vaporising water, for the reason that water didn't reach boiling point. The lack of the heat left in the kettle's base was reduced by leaving the water within the kettle for a defined interval after the heating ingredient had been turned off.
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