An electric kettle can sound loud because water moves rapidly when it is heated by a high-power heating plate. Many electric kettles are rated around 1500W to 2200W, so water temperature rises quickly. As water approaches about 100°C at normal atmospheric pressure, steam bubbles form, collapse, and create strong rumbling noise.

An electric kettle makes noise mainly because water moves quickly during heating. When the heating plate becomes hot, small steam bubbles form near the bottom, collapse, and create a rumbling sound. As the water gets close to 100°C at normal atmospheric pressure, bubbling becomes stronger.

An electric kettle makes noise because water moves rapidly as it heats. When the heating plate becomes hot, small steam bubbles form near the bottom, collapse, and create a rumbling sound before boiling. As the water gets closer to 100°C at normal atmospheric pressure, the sound often becomes stronger.