resistors
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The
photon sensitive CdS photoresistor is a very common component for
sensing light levels in automated lighting systems. As light intensity increases on the cadmium sulphide element the resistance drops. In a sense this device acts much like a variable resistor that is activated by light. You have probably seen them on night lights
in the home or in industrial units that you have installed. |
RESISTANCE VS. LIGHT INTENSITY (CdS RESISTOR) Notice that when light intensity increases the resistance decreases. |
Can you spot the CdS cell in this night light? | |
Resistor
Colour Code Calculator |
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Try a few examples until you get the feel of how the colour code works. |
Thermal
resistors change resistance as the temperature changes. Resistance can signal temperature to a control system Resistance usually increases with increases in temperature. Maybe your microwave oven has a thermistor probe to help to help determine the internal temperature of cooking food. |