Variable resistance
- Created by: Daisy Fletcher-Cooney
- Created on: 06-04-15 21:05
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- Variable Resistance
- Filament bulbs
- As the potential difference across the wire increases, the electrons move more rapidly
- Diodes and LEDs
- A current can only flow through a diode in one direction
- The resistance of the diode is very high in the reverse direction
- A light-emitting diode (LED) will only give out light when the current flows in the forward direction above a small threshold
- Filament bulbs
- LDR
- The resistance of a light-dependent resistor (LDR) falls as the intensity of light falling on it increases
- An LDR allows more current to flow in the light compared to the dark
- Variable Resistance
- Filament bulbs
- As the potential difference across the wire increases, the electrons move more rapidly
- Diodes and LEDs
- A current can only flow through a diode in one direction
- The resistance of the diode is very high in the reverse direction
- A light-emitting diode (LED) will only give out light when the current flows in the forward direction above a small threshold
- Filament bulbs
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