Page 92 - KEC Khaitan C8.2 Flipbook
P. 92
Capacity (mAh): Indicates how long a battery can provide power before needing replacement
or recharging.
Polarity: Batteries have positive (+) and negative (-) terminals, which must be connected
correctly.
Did You Know?
Rechargeable batteries (like Li-ion and NiMH) are more eco-friendly and cost-effective than
disposable ones!
4. Light Emitting Diodes (LEDs)
An LED (Light Emitting Diode) is a semiconductor that produces light when current flows through
it. LEDs are widely used in traffic lights, indicators, and displays due to their energy efficiency
and long lifespan.
Key Features of LEDs:
LEDs have two terminals:
Anode (+, longer leg) Connects to the positive terminal.
Cathode (-, shorter leg) Connects to the ground (negative terminal).
LEDs require a resistor to limit the current and prevent damage.
Did You Know?
Unlike traditional bulbs, LEDs do not get hot easily because they don’t rely on a filament to
produce light.
Example Use: Used in indicator lights, displays, and robotics projects.
Symbol in Circuit Diagram:
Fun Fact: LEDs are more energy-efficient than traditional bulbs and come in different colors
depending on the materials used.
BASIC CIRCUIT DESIGN
A circuit is a closed path through which electricity flows. When designing circuits, we use circuit
diagrams to represent the components and their connections.
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