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Abeka Physical Science > Test 8 > Flashcards

Test 8 Flashcards

1
Q

Opposite charges accumulate in a cloud and on the ground, causing an electrostatic discharge called _______.

A

lightning

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2
Q

What type of electric generator uses a commutator?

A

DC

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3
Q

A group of cells arranged in a parallel has the same voltage as any single cell, but the maximum currents of all the cells are _____ together.

A

added

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4
Q

The _____ lamp is the most efficient lamp.

A

LED

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5
Q

What is the most common type of electrostatic generator in use today?

A

Van de Graaf

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6
Q

A(n) _______ lamp produces light by passing current through a narrow tube of gas.

A

fluorescent

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7
Q

A(n) ______ lamp produces light by heating a thin piece of wire.

A

incandescent

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8
Q

A metal-topped car is safe shelter in a storm because the charge passes _______ the outside surface of the car.

A

over

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9
Q

In a Leyden jar, charge is stored on foil lining the ______ of a glass jar.

A

inside

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10
Q

A ________ cell converts absorbed sunlight directly into electricity.

A

photovoltaic

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11
Q

What is the component within an electric motor that is a freely rotating electromagnet mounted on a shaft?

A

armature

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12
Q

What is the component of an AC electric generator that keeps its wires from twisting?

A

slip ring

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13
Q

What converts electricity into sound waves?

A

loudspeaker

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14
Q

What is designed to convert electricity into back-and-forth motion?

A

solenoid

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15
Q

What uses electromagnets to allow communication over long distances?

A

telegraph

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16
Q

What is an electrical switch operated by an electromagnet?

A

relay

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17
Q

The negative terminal of a voltaic cell is called the _______.

A

anode

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18
Q

What was the early device developed by Musschenbroek to store electric charge?

A

Leyden jar

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19
Q

The first electric light suitable for household use was the _______.

A

incandescent lamp

20
Q

To boost the available voltage, electrochemical cells can be arranged in _______.

A

series

21
Q

What is a device for protecting buildings and other structures from lightning strikes?

A

lightning rod

22
Q

The ability of magnetism to convert mechanical motion into electric current is called _______.

A

electromagnetic induction

23
Q

What is a device that increases or decreases the voltage of alternating current?

A

transformer

24
Q

One or more electrochemical cells connected to terminals as a single source of current form a _______.

A

battery

25
Q

What material glows when exposed to radiation?

A

phosphor

26
Q

A permanent magnet used to provide a stationary magnetic field is called a _______.

A

field magnet

27
Q

What natural electrostatic phenomenon, also known as corona discharge, is an accumulation of electrons around pointed objects that results in an eerie blue glow?

A

St. Elmo’s fire

28
Q

What is the positive terminal of a voltaic cell called?

A

cathode

29
Q

What system of communication uses a combination of long and short clicks to transmit messages over long distances?

A

Morse code

30
Q

What is the general term for a device that produces static electricity?

A

electrostatic generator

31
Q

What type of electric discharge lamp is filled with neon gas?

A

neon lamp

32
Q

What type of electrochemical cell is not designed to be recharged?

A

voltaic cell

33
Q

What is a device that uses electromagnetic induction to produce electricity?

A

electric generator

34
Q

Who discovered that mechanical motion can produce electricity by magnetic force?

A

Michael Faraday

35
Q

Who patented the telegraph?

A

Samuel Morse

36
Q

Whose experiment demonstrated that lightning is caused by static electricity?

A

Benjamin Franklin

37
Q

Who built the first electrostatic generator?

A

Otto von Guericke

38
Q

What is a modern lamp that consists of a long, coiled tube and can be used in sockets designed for incandescent lamps?

A

CFL

39
Q

Electric charge on an object always moves to the _______ of an object.

A

outside

40
Q

What is the most important device for converting electricity into motion?

A

electric motor

41
Q

What is an electrostatic method of reproducing images on paper?

A

xerography

42
Q

What is a device in which a conducting fluid passes through a magnetic field at high speeds?

A

magnetohydrodynamic generator

43
Q

What is a small AC generator that recharges a car’s battery and operates its electrical system while the car is running?

A

alternator

44
Q

The semiconductor device that emits light when a direct electric current is applied is a __________.

A

light-emitting diode

45
Q

In an electrostatic generator, the charge is most concentrated wherever the contour comes to a ______.

A

point

46
Q

A transformer that decreases the voltage is a ________ transformer.

A

step-down

Abeka Physical Science (9 decks)

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