mica
asbestos
glass wool
porcelain
reduce the current for controlling the temperature
change the direction of current flow for controlling the temperature
regulate the heat and thus the temperature by switching the element to ON-OFF
switch ON-OFF the indicator lamp
repulsion motor
permanent capacitor motor
capacitor-start induction-motor
shaded-pole motor
decrease the current
drop the voltage applied to the fan
increase the speed
increase the torque
protect the fan in case a fault occurs
produce a phase-shift
control the speed