FCC Technician Exam Question Of The Day (T6D07)

Q) Which of the following is commonly used as a visual indicator?


NJ2X Notes:
LED's or Light Emitting Diodes are replacing incandescent and other less efficient forms of lighting.  This replacement has been evident for years now in low wattage lighting applications such as indicator lights and back lighting on radios.  Higher wattage lighting is now also being replaced by LED's.  We use Philips LED light bulbs throughout our home and really love the how they have reduced our power bill while producing an excellent quality of light that lasts and lasts.

From the FCC Element 2 Technician Class Question Pool
Effective July 1, 2010 for examinations  and is valid until June 30, 2014