Lighting Technology

Explain the working principle of an incandescent lamp.

• An incandescent lamp produces light by cooling a tungsten filament with an electric current.

• An incandescent lamp produces light by using a fluorescent tube.

• An incandescent lamp produces light by heating a copper filament with an electric current.

• An incandescent lamp produces light by heating a tungsten filament with an electric current.

Describe the working principle of a fluorescent lamp.

• Fluorescent lamps work by burning a gas to produce light

• Fluorescent lamps operate by exciting mercury vapor with an electric current to produce ultraviolet light, which is then converted into visible light by a phosphor coating.

• Fluorescent lamps operate by using magnets to create light

• Fluorescent lamps generate light through a chemical reaction with water

What is the main difference in the working principle between incandescent and fluorescent lamps?

• Incandescent lamps produce light by passing an electric current through mercury vapor, while fluorescent lamps produce light by heating a filament wire.

• Incandescent lamps produce light by heating a filament wire, while fluorescent lamps produce light by passing an electric current through mercury vapor and phosphor coating.

• Incandescent lamps use a combination of mercury vapor and phosphor coating to produce light, while fluorescent lamps use a filament wire.

• Incandescent lamps and fluorescent lamps both produce light by heating a filament wire.

How does an incandescent lamp produce light?

• By absorbing light from the surroundings and re-emitting it

• By using a chemical reaction to produce light

• By harnessing solar energy to emit light

• By passing an electric current through a thin filament, heating it until it glows white-hot and emits light.

How does a fluorescent lamp produce light?

• By passing an electric current through mercury vapor and causing the phosphor coating to fluoresce

• By heating up a tungsten filament until it glows

• By reflecting sunlight through a series of mirrors

• By using a chemical reaction to generate light

Why are incandescent lamps less energy-efficient compared to fluorescent lamps?

• Incandescent lamps have a longer lifespan than fluorescent lamps.

• Incandescent lamps are cheaper to manufacture than fluorescent lamps.

• Incandescent lamps are more durable than fluorescent lamps.

• Incandescent lamps waste energy by producing heat in addition to light.

Discuss the role of the filament in an incandescent lamp.

• The filament in an incandescent lamp is used for cooling the bulb.

• The filament in an incandescent lamp produces light through incandescence when an electric current passes through it.

• The filament in an incandescent lamp absorbs light instead of producing it.

• The filament in an incandescent lamp is made of plastic.

What is the function of the mercury vapor in a fluorescent lamp?

• To increase the lifespan of the lamp

• To provide color to the light

• To emit ultraviolet light to excite the phosphor coating and produce visible light

• To generate heat for the lamp

Explain the process of ionization in a fluorescent lamp.

• Ionization is initiated by the interaction of ultraviolet light with the lamp's glass casing.

• Ionization occurs due to the presence of magnets in the fluorescent lamp.

• The process of ionization in a fluorescent lamp involves the electrical current passing through the mercury vapor, causing some mercury atoms to lose electrons and become positively charged ions.

• The process of ionization involves the release of water vapor within the lamp.

Compare the lifespan of incandescent and fluorescent lamps.

• Fluorescent lamps have a shorter lifespan compared to incandescent lamps.

• Fluorescent lamps have a longer lifespan compared to incandescent lamps.

• Incandescent lamps have a longer lifespan compared to fluorescent lamps.

• Fluorescent lamps and incandescent lamps have the same lifespan.