physics lesson 6 unit 6

The abbreviation CFL stands for _____.

compact fluorescent lamp.

An electric generator or motor has a stationary field magnet; this part is called the _______.

stator.

The discovery by Nikola Tesla that is considered to be one of the 10 greatest discoveries of all time was _____.

that out-of-phase alternating currents caused rotation

fluorescence

the emission of light by a substance that has absorbed light or other electromagnetic radiation of a different wavelength

incandescence

the emission of visible light by a body caused by its high temperature

Two difficulties encountered with the use of the arc lights were ________ and _________.

the light was garish the light was too bright

stator

the stationary or nonmoving part of a rotor system found in electric generators and motors; it may act as the field magnet

The function of the stator in Tesla's induction motor was _____.

to rapidly change the magnetic polarity in the stator causing the armature (rotor) to follow

Filaments of modern incandescent bulbs: ________

tungsten.

The principle behind the operation of an arc light is _____.

high voltage that creates an arc between carbon electrodes

The emission of visible light caused by a high temperature is called _____.

incandescence.

The invention of the AC ___________ overcame the major objection of using AC instead of DC.

induction motor

Why were glowing filaments with low voltages sought after for lighting rather than arc light?

safer, cheaper, and more pleasant light than arc lamps.

Match the invention or improvement with the corresponding inventor or improver. produced compact fluorescent lamps (CFLs) (1970-2000)

Many manufacturers

Match the invention or improvement with the corresponding inventor or improver. alternating current motors and transformers

Nikolas Tesla

Problems with arc lamps included:

There were several disadvantages to the arc lamp: They were expensive to produce and operate. They burned out quickly. They sometimes burned down the building where they were being used!

Match the invention or improvement with the corresponding inventor or improver. first practical and commercially feasible light bulb (1879)

Thomas Alva Edison

An important feature of Nikola Tesla's induction motor was that ran on AC current and had no ______.

brushes.

The emission by a substance that has absorbed light or other electromagnetic radiation of a different wavelength is called ______

fluorescence.

Thomas Alva Edison patented a(n) ________ bulb that contained a carbon filament with the majority of oxygen removed.

incandescent

The original incandescent light bulb converted 98% of the electrical energy they consumed into heat not light.

98 and heat

Some advantages of electric energy over other types are:

Compared to other forms of energy, electricity is fairly plentiful and relatively inexpensive to produce and transport.

22) Match the invention or improvement with the corresponding inventor or improver. tungsten halogen lamp

General Electric

Match the invention or improvement with the corresponding inventor or improver. fluorescent light bulb (1939)

General Electric

Match the invention or improvement with the corresponding inventor or improver. coiled tungsten filament joined with inert gas inside bulb—brighter light

Irving Langmuir