MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Four thermistors. Left to right are; a bead thermistor, a bead thermistor, a disk thermistor and a rod thermistor. Thermistors are semiconductor devices that change resistance with changing temperature. This can be used to switch devices like refrigerators and kettles on or off.
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