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Junior Cert Electronics

Diode Allows Electricity to flow in one direction only ("PN" turns into symbol) Can be used to convert a.c. to d.c.
LED Light Emitting Diode It gives out light when a current passes through it.
LDR Light Dependant Resistor It is used to turn on and off street lights
Forward Bias "P" terminal connected to the Positive end and "N" Terminal to the negative end
Negative Bias "P" terminal connected to the Negative end and "N" Terminal to the Positive end
Everyday Applications of an LED Used in mobile phones, computers, display boards,
Everyday Applications of a Diode In electrical circuits can be used to make sure electricity flows only in one direction. Can be used to convert a.c. to d.c.
Everyday Applications of a LDR Used in cameras to control the settings while taking photos in bright and dark light situations
How do you measure the resistance of an LDR under varying degrees of brightness of Light? Connect up an Ohmmeter, dimmer switch and lamp and measure the resistance under different levels of brightness.
How does the resistance in an LDR vary with Light levels? The value of the resistance increases as the brightness of the Light is decreased
What electronic device is always used with an LED? Needs a resistor in series with it.
How is the device which is always used with the LED attached in a circuit? Always in Series
Created by: p-furl1