P2, Non-Ohmic Devices

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  • 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
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What does a diode allow current to do
Only pass through in one direction (forward biased)
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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
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What do LED's do?
Emit light when current flows through
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Why are LED's becoming more popular?
Becuase they require a smaller amount of current than a filament bulb. This saves energy
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What is the resistance like on a thermistor?
Resistance decreases as temperature increases
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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
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What is the resistance like on an LDR
Resistance increases as light intensity increases
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What is an LDR used for?
Used for lights which automatically switch on when it gets dark- i.e. street lights
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Other cards in this set

Card 2

Front

What does a diode allow current to do

Back

Only pass through in one direction (forward biased)

Card 3

Front

What doesen't a diode let current to?

Back

Preview of the front of card 3

Card 4

Front

What do LED's do?

Back

Preview of the front of card 4

Card 5

Front

Why are LED's becoming more popular?

Back

Preview of the front of card 5
View more cards

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