Starter: use Pg to complete the table

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Presentation transcript:

Starter: use Pg 206-211 to complete the table LO: Describe the action of thermistors and light- dependent resistors and show understanding of their use as input transducers LDR’s and Thermistors Component Circuit symbol Diode Light Dependent Resistor Starter: use Pg 206-211 to complete the table Variable Resistor Thermistor Can you think of any electrical devices which turn on without a switch?

Light dependant resistor – resistance DECREASES when light intensity INCREASES Street lamps use LDR’s so they know when to switch on and off Digital cameras use LDR’s to control the amount of light which is allowed in Resistance Amount of light

Thermistor – resistance DECREASES when temperature INCREASES Used in central heating timers

Students need to look at the following pictures and write down what they have in common – that they all need electricity to work. Which is the odd one out? 4