P2, Non-Ohmic Devices 0.0 / 5 ? PhysicsElectricityGCSEAQA Created by: emmajane_Created on: 13-04-14 14:19 What happens when a filament lamp heats up? The resistance increases, causing the graph to curve 1 of 9 What does a diode allow current to do Only pass through in one direction (forward biased) 2 of 9 What doesen't a diode let current to? When current tries to flow the other way (reversed biased) no current is allowed to flow through the diode 3 of 9 What do LED's do? Emit light when current flows through 4 of 9 Why are LED's becoming more popular? Becuase they require a smaller amount of current than a filament bulb. This saves energy 5 of 9 What is the resistance like on a thermistor? Resistance decreases as temperature increases 6 of 9 Why are thermistors used and what are they used for? Used as thermostats because thermistors are used in circuits which monitor and control temperature, such as rooms, fridges and freezers 7 of 9 What is the resistance like on an LDR Resistance increases as light intensity increases 8 of 9 What is an LDR used for? Used for lights which automatically switch on when it gets dark- i.e. street lights 9 of 9
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