TCC - Ch 6 Electric Lightbulbs Efficiency

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Candle power

original unit of light intensity

Lux

the SI unit of illuminance, equal to one lumen per square metre.

Lumen

the SI unit of luminous flux, equal to the amount of light emitted per second

Watts

the unit of power (rate of doing work).

Quatz halogen spot lights

(of a high-intensity electric lamp) using a quartz bulb containing the vapour of a halogen, usually iodine.

Dimmer switch

A switch that can control voltage and current flow by increasing or decreasing resistance. Use a variable resistor to do this - affects light intensity, BUT does not reduce power consumption!

Compact Fluorescent

Compact fluorescent lamps (CFL) are small fluorescent light bulbs that use up to 75% less energy than a traditional incandescent bulb

Fluorescent tube

Gas filled tube with fluorescent powder that glows with electrical charge.

LED light

LED stands for light-emitting diodes. A solid-state highly efficient light source.

Energy efficient

Products and systems that use less energy than their conventional counterparts to perform the same tasks - ie energy efficient light bulbs.

Amperage

The actual amount of flow of electricity or electrons; the unit is the amp or ampere.

Footcandle

The basic unit of illumination arriving at a work surface. One footcandle is equal to one lumen per square foot.

Carbon footprint

The cumulative amount of carbon, or carbon dioxide equivalent, that a person or institution emits, and is indirectly responsible for emitting, into the atmosphere, contributing to global climate change.

Amp hour

The most common unit used to express battery capacity. Amp hours are a product of current and time - measure of total usable charge inside of the battery.

Incandescent bulb

a lightbulb in which electricity passes through a wire, that heats up and produces light

Energy emission

after atom in excited state returns to ground state, emits photon of energy in form of electromagnetic radiation

Halogen bulb

an incandesent lamp that burns brighter than regular light bulbs


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