This text studies my empirical measurements to estimate the efficiency of a portable induction hob and Alpha Heater product page of an electric kettle heating water to a temperature under boiling point. A identified amount of water was heated for 100 seconds and its temperature change was measured. The electrical energy consumed was measured using a plug-in power meter. The figure for electrical power is an estimate of the average, because neither the induction hob nor the kettle consumed precisely constant energy. The facility reading for the kettle was 2.142 kW close to the start of heating and had fallen to 2.122 kW after about 70 seconds. In general it declined slightly 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, including the general efficiency. The heat energy in the water was calculated using 4.18 kJ/kg as the specific heat of water. The electrical energy was calculated by multiplying the facility reading from the facility meter by the time the ability was applied (one hundred seconds).

Both the kettle and Alpha Heater product page the induction hob stood unused for hours earlier than they have been used for this experimental heating. The induction alpha heater price was used on its highest energy setting, a nominal 2000 watts. In each instances after 100 seconds, the power was switched off. In the case of the kettle, the water was then left for an additional 30 seconds to absorb extra heat from the kettle's base. In each cases, after this heating interval the water was poured shortly right into a vacuum flask, sealed and shaken. Within the case of the saucepan, a plastic funnel was used to allow quicker pouring into the flask. The flask was then re-opened to make the measurement of the water's remaining uniform temperature. Temperature was measured with a K-type thermocouple. The calculated efficiency, Alpha Heater product page which means the proportion of electrical vitality used that was transformed to heat in the water, was roughly 84% for the electric kettle and roughly 79% for the alpha heater portable induction hob with the enamel pan.

Both these figures may be underneath-estimates because no allowance has been made for heat loss that happens in transferring the water to the flask or to the thermal capacity of the flask. In fact there are additionally many other potential sources of inaccuracy together with the scales used to weigh the water, the thermometer and the electrical energy meter. No attempt has been made to quantify these right here. Also it may be attainable to get more heat from the kettle by leaving the water for a special size of time after turning the heating element off. The choice of 30 seconds is arbitrary and additional work would be wanted to optimise this. For the kettle, this experiment was designed to mitigate or avoid the causes of inefficiency on this kettle highlighted in a previous article Illustrating two causes of inefficiency in electric kettles sold within the 2020s. Here, no heat was wasted by its delayed automatic reduce-out, since the reduce-out was not used. No heat was wasted vaporising water, because the water didn't attain boiling point. The lack of the heat left within the kettle's base was decreased by leaving the water within the kettle for a defined period after the heating element had been turned off.

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