Describe LEDs.
What will be an ideal response?
Light Emitting Diodes (LED) are small light bulbs based on semiconductor technology. The electrons of a semiconductor diode are brought from a state of high energy to a state of low energy with the energy difference being emitted in the form of light. Until recently, LEDs were used only in single-bulb applications, such as in instrument panels and electronics. Today, LED bulbs are made by clustering many small bulbs encased in diffuser lenses that spread light in wider beams. Bulbs are available with standard bases to fit common household light fixtures.
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What do we mean by “enemies” of the forest?
What will be an ideal response?
Which of the following is true of mill scale?
A. The porosity it causes is most often confined to the interior of the weld. B. It is removed even for noncode welding. C. With GMA welding wire, deoxidizer eliminates the adverse effects of mill scale. D. It increases the chance of rusting.
List the definition of a henry (H).
What will be an ideal response?
Before replacing parts such as bits, blades, or discs on any tool, you must _____
A) polish it with a fine steel wool B) recharge the tool?s battery C) disconnect the power source D) inspect them for cracks