Test 8

Question 1

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

Answer 1

lightning

Question 2

What type of electric generator uses a commutator?

Answer 2

DC

Question 3

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.

Answer 3

added

Question 4

The _____ lamp is the most efficient lamp.

Answer 4

LED

Question 5

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

Answer 5

Van de Graaf

Question 6

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

Answer 6

fluorescent

Question 7

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

Answer 7

incandescent

Question 8

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

Answer 8

over

Question 9

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

Answer 9

inside

Question 10

A ________ cell converts absorbed sunlight directly into electricity.

Answer 10

photovoltaic

Question 11

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

Answer 11

armature

Question 12

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

Answer 12

slip ring

Question 13

What converts electricity into sound waves?

Answer 13

loudspeaker

Question 14

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

Answer 14

solenoid

Question 15

What uses electromagnets to allow communication over long distances?

Answer 15

telegraph

Question 16

What is an electrical switch operated by an electromagnet?

Answer 16

relay

Question 17

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

Answer 17

anode

Question 18

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

Answer 18

Leyden jar

Question 19

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

Answer 19

incandescent lamp

Question 20

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

Answer 20

series

Question 21

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

Answer 21

lightning rod

Question 22

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

Answer 22

electromagnetic induction

Question 23

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

Answer 23

transformer

Question 24

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

Answer 24

battery

Question 25

What material glows when exposed to radiation?

Answer 25

phosphor

Question 26

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

Answer 26

field magnet

Question 27

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

Answer 27

St. Elmo's fire

Question 28

What is the positive terminal of a voltaic cell called?

Answer 28

cathode

Question 29

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

Answer 29

Morse code

Question 30

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

Answer 30

electrostatic generator

Question 31

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

Answer 31

neon lamp

Question 32

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

Answer 32

voltaic cell

Question 33

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

Answer 33

electric generator

Question 34

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

Answer 34

Michael Faraday

Question 35

Who patented the telegraph?

Answer 35

Samuel Morse

Question 36

Whose experiment demonstrated that lightning is caused by static electricity?

Answer 36

Benjamin Franklin

Question 37

Who built the first electrostatic generator?

Answer 37

Otto von Guericke

Question 38

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

Answer 38

CFL

Question 39

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

Answer 39

outside

Question 40

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

Answer 40

electric motor

Question 41

What is an electrostatic method of reproducing images on paper?

Answer 41

xerography

Question 42

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

Answer 42

magnetohydrodynamic generator

Question 43

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

Answer 43

alternator

Question 44

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

Answer 44

light-emitting diode

Question 45

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

Answer 45

point

Question 46

A transformer that decreases the voltage is a ________ transformer.

Answer 46

step-down