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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