Technician A says that when replacing a tungsten lightbulb element, you should avoid touching the bulb with your bare hands. Technician B says that halogen headlights produce about twice as much brightness measure in candle power as incandescent headlights. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
Answer: C
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Current in a parallel circuit ________
A) decreases as additional resistors are added in parallel B) increases as additional resistors are added in parallel C) stays the same across parallel branches as additional resistors are added in parallel
Technician A says that paint is made from binders, solvents, pigments, and additives. Technician B says that paint is made from pigments and solvents. Who is correct?
A. Technician A only B. Technician B only C. Both Technicians A and B D. Neither Technician A nor B
An ionization smoke detector contains a material which ionizes the air in the sensing chamber, thus rendering it conductive and permitting a current to flow between two charged electrodes. This gives the sensing chamber an effective electrical conductance. When smoke particles enter the ionization area, they decrease the conductance of the air by attaching themselves to the ions, causing a reduction in mobility. When the conductance is less than a predetermined level, the detector responds. What material ionizes the air in the sensing chamber?
A. a small amount of magnesium B. a small amount of radioactive material C. a small amount of copper material D. a small amount of hydrogen gas
Identify each of these signals as either an energy signal or a power signal and find the signal energy of energy signals and the average signal power of power signals.
