An LED and its current-limiting resistor are connected to a driving circuit with a peak output of 9 V. The LED has a forward voltage (VF) rating of 1.6 to 2.2 V and a forward current (IF) rating of 15 mA (maximum). Using the 80% guideline, what is the smallest standard-value current limiting resistor needed in the circuit?
A) 720 ? B) 520 ? C) 680 ? D) 570 ?
C
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What is the appropriate activity coefficient for dissolved cyanide, CN- in this solution if the sodium cyanide is the only dissolved species? (Use the Güntelberg approximation.)
A waste stream of 20,000 gal/min contains 270 mg/L of cyanide as NaCN. What will be an ideal response?
If a combination of white and black is added to a hue, the hue becomes grayed and is known as a ____
a. tint c. shade b. tone d. tertiary color
LP gas is considered more hazardous than natural gas because
A) LP gas is flammable B) LP tends to puddle in low areas but natural gas tends to dissipate C) LP gas is poisonous D) LP gas is flammable and poisonous
If the full-load motor speed of 1,800 rpm is increased to 2,000 rpm when the load is removed, its speed regulation is what percent?.
What will be an ideal response?