Q2 Give two uses of LEDs.
Kindly, refer to the below link for similar query,
https://www.meritnation.com/ask-answer/question/for-what-purpose-leds-are-used/chemical-effects-of-electric-current/3993746
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https://www.meritnation.com/ask-answer/question/for-what-purpose-leds-are-used/chemical-effects-of-electric-current/3993746
Regards.