Additional science- circuit devices 0.0 / 5 ? PhysicscircuitGCSEAQA Created by: nimrahali12Created on: 25-09-16 15:25 The current only flows in one direction through? diode 1 of 22 What is a diode? is a special device made from semi conductor material such as silicon 2 of 22 It is used to regulate? the potential difference in circuits 3 of 22 It lets current flow freely through it in one direction, but not? in the other because there is high resistance in the reverse direction 4 of 22 This turns out to be real useful in? various electronic circuits 5 of 22 Light emitting diodes are? very useful 6 of 22 A light emitting diode (LED) emits light when? a current flows through it in the forward direction 7 of 22 LEDs are being used more and more as lightnings as they use a much smaller current than? other forms of lighting 8 of 22 LEDs indicate? the presence of current in a circuit 9 of 22 They are often used in? appliances to show that they are switched on 10 of 22 They are also used in? for the numbers on digital clocks in traffic lights and in remote controls 11 of 22 What does LDR stand for? light-dependant resistor 12 of 22 What is LDR? is a resistor that is dependant on the intensity of light 13 of 22 In bright light , the resistance? falls 14 of 22 In darkness the resistance is? The highest 15 of 22 They have lots of applications including? automatic night lights , outdoor lighting and burglar detectors 16 of 22 The resistance of a thermistor decreases as? temperature increases 17 of 22 What is a thermistor? temperature dependant resistor 18 of 22 In hot conditions , the resistance? drops 19 of 22 In cool conditions , the resistance? goes up 20 of 22 Thermistor make useful ? temperature detectors 21 of 22 For example? car engine temperature sensors and electronic thermostats 22 of 22
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