Lighting uses energy in various ways to enhance what we see around us. Take this quiz to determine see how enlightened you are about lighting.
What is the main reason why a regular incandescent bulb is not energy efficient?
Most of the electricity is used to make the gas reactive.
Most of the electricity goes into heating the filament.
Much of the electricity used in an incandescent bulb turns into heat instead of light. Since the main function of a light bulb is to provide light, all of the heat generated is considered a waste of energy.
Most of the electricity used to overcome fluorescence.
What happens to an incandescent bulb to cause it to burn out?
The tungsten filament is slowly vaporized, leaving a thin spot that eventually breaks.
During the process of making light the tungsten filament is slowly vaporized onto the glass bulb until the filament is so thin that it breaks. When the filament breaks, the electric circuit is open and electricity no longer flows to illuminate the bulb.
The gas in the bulb is slowly depleted until there is not enough to create light.
The bulb gets hotter with each use until the solder attaching the filament melts.
What is the effect on a heated tungsten filament when used in a bulb filled with halogen gas?
The halogen gas forms a protective coating on the filament.
The halogen gas atoms combine with vaporized tungsten and deposit it onto the filament.
Inside a hot bulb, the vaporized tungsten combines with the halogen gas atoms and is deposited back onto the filament. This process insures that the halogen bulb lasts much longer than its incandescent cousin by regenerating the filament.
The halogen gas prevents the filament from releasing any vaporized tungsten.
Fluorescent bulbs produce far less heat and far more light than incandescent bulbs. Large buildings use fluorescent lights not only for their efficiency, but also because less heat means lower air conditioning costs.
produce approximately the same amount of heat as incandescent bulbs.
What would be the typical filament combination inside a bulb rated at 150-watts maximum output?
one 100-watt and two 50-watt
one 100-watt and one 50-watt
A typical three-way bulb rated at a maximum output of 150-watts contains one 50-watt filament and one 100-watt filament. The low setting energizes the 50-watt filament, the medium setting energizes the 100-watt filament and the maximum setting energizes both the filaments.
How much more efficient are fluorescent tubes in producing light than a typical incandescent light?
four to six times
Fluorescent tubes produce four to six times more light than an incandescent bulb with the same wattage rating. The increased efficiency applies to regular tubes, circular tubes and the newer compact fluorescent bulbs.