| 摘要 |
<p>Apparatus (1a, 1b) for heating liquids has a receptacle (10) for receiving liquid to be heated, a heating element (30) in the form of a support (31) having an electrically insulating surface (32b) carrying a resistive track (33) for heating liquid within the receptacle (10) and a control arrangement (40) for controlling the supply of power to the heating element (30). The control arrangement (40) includes a detector (41) for detecting deflection of the heating element (30) during operation of the apparatus and for reducing the power supply to the heating element (30) when the deflection of the heating element (30) exceeds a predetermined amount so providing a simple, efficient way of switching off the apparatus if the heating element (30) overheats due to, for example, the apparatus being boiled dry or the vessel (2a, 2b) being tilted to expose the heating element out of the liquid being heated.</p> |
