January 14th, 2014

Notes on Electronics

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JUNIOR CERT SCIENCE - ELECTRONICS

• Electronics is the control of small electric currents.

Diodes

• A diode is a component that allows electricity to flow in one direction only.

LEDs

• LED stands for light emitting diode.
• An LED is a diode that gives out light when electricity flows through it.
• LEDs use less current than a bulb.
• LEDs are used in calculators and fridges.

LDR

• LDR stands for light dependant resistor.
• An LDR is a resistor whose resistance depends on the amount of light.
• The resistance of an LDR decreases as the light increases.
• LDRs are used in street lighting and cameras.