Midterms

Question 1

The form of energy generated by friction, induction, or chemical change has a magnetic, chemical, and radiant effect.

Answer 1

Electricity

Question 2

He recorded that after rubbing amber with a piece of wool or fur other light objects such as straw or feathers were attracted to the amber.

Answer 2

Thales of Miletus

Question 3

Latin and Greek term of electricity.

Answer 3

electricus - produce form amber by friction
elektor - beaming sun

Question 4

Father of Electricity

Answer 4

William Gilbert

Question 5

Built the first electric generator. Constructed of a ball of sulfur, rotated by a crank with one hand and rubbed with the other.

Answer 5

Otto von Guericke

Question 6

Distinguished between materials that are conductors and nonconductors. Credited with discovering that electricity can flow.

Answer 6

Stephen Gray

Question 7

Inventors of Leyden Jar; demonstrated that electricity can be stored for future use.

Answer 7

Ewald Georg von Kleist, Pieter van Musschenbroek

Question 8

Suggested the existence of an electric fluid and surmised that an electric charge was made up of two types of electric forces; attractive and repulsive.

Answer 8

Benjamin Franklin

Question 9

The famous kite experiment

Answer 9

Benjamin Franklin

Question 10

Observed that a discharge of static electricity made a dead frog’s leg twitch; frog’s legs contained electricity and were released when it touched metal.

Answer 10

Luigi Galvani

Question 11

Expanded Galvani’s findings and built voltaic pile, early type of electric cell/battery.

Answer 11

Alessandro Volta

Question 12

Discovered that a magnetic field surrounds a current-carrying wire; electrical currents affected the needle on a compass.

Answer 12

Hans Christian Oersted

Question 13

Observed that a coil of wires acts like a magnet when electrical current is pass through it.

Answer 13

Andre Marie Ampere

Question 14

Demonstrated an electromagnetic device that was capable of lifting over a thousand pounds.

Answer 14

Dominique Francois Arago & Joseph Henry

Question 15

Formulated law showing the relationship between volts, amps, and resistance.

Answer 15

Georg Simon Ohm

Question 16

They developed mathematical relationships and rules concerning electrical circuiting.

Answer 16

James Prescott Joule, Gustav Robert Kirchhoff, James Clerk Maxwell

Question 17

Conceived the idea of sending code messages over wires using the electromagnetic telegraph and a code of electrical impulses identified as dots and dashes.

Answer 17

Samuel Morse, Morse Code

Question 18

Developed a crude electric motor.

Answer 18

Michael Faraday

Question 19

First person to measure the amount of electricity and magnetism generated in a circuit.

Answer 19

Charles-Agustin de Coulomb

Question 20

Developed a practical incandescent lamp.

Answer 20

Thomas Edison, Joseph Swan

Question 21

First to patent the commercially feasible incandescent lamp. His Electric Light Company…

Answer 21

Thomas Edison, General Electric

Question 22

Developed plans for an alternating current induction motor– successful utilization fo alternating current.

Answer 22

Nikola Tesla

Question 23

Announced the first transformer.

Answer 23

Lucien Gaulard, John Dixon Gibbs

Question 24

Bought the patent rights to Tesla’s alternating current system.

Answer 24

George Westinghouse

Question 25

Date: The first alternating current power station was placed in operation; the output was limited to lighting.

Answer 25

1886

Question 26

Date: Large-scale electric power distribution began when water flowing over Niagara Falls was diverted through a pair of high speed turbines which powered nearby manufacturing.

Answer 26

August 25, 1895

Question 27

Date: Alternating current motor was introduced and commonly used electric motor in buildings.

Answer 27

1888

Question 28

Negatively charged particle of an atom.

Answer 28

Electron

Question 29

Positively charged particle of an atom. Weighs about 1850 times as much as electron.

Answer 29

Proton

Question 30

Particle of an atom which is not electrically charged and weighs slightly more than proton.

Answer 30

Neutron

Question 31

The five theory of Electricity

Answer 31

1. all matters are made up of molecules. 2. molecules are made up of atoms, 3. atom contains n, e, p. 4. n. is neutral; neither +/- 5. electron of an aton of any substance could be transformed into another atom.

Question 32

Rate or measure of power used or consumed.

Answer 32

Watt

Question 33

Refers to the wire installation that supply current to light and convenient outlets.

Answer 33

Curcuit

Question 34

Carries electric current without providing too much resistance to current flow.

Answer 34

Conductor

Question 35

Materials that resist the flow of electricity.

Answer 35

Insulators

Question 36

Materials that are neither good conductors nor good insulators.

Answer 36

Semiconductors

Question 37

Electrons which are loosely bound to their nuclei.

Answer 37

Free electrons

Question 38

When an atom has anequal number of electrons and protons, charges cancel...

Answer 38

Electrically neutral or uncharged

Question 39

Electrically charged atom: Electrons < Protons = ? Elecrons > Protons = ?

Answer 39

Positively Charged Negatively Charged

Question 40

Term applied to an aton/molecule which is not electrically balanced. Positively charged atom... Negatively charged atom...

Answer 40

Ion Positive Ion Negative Ion

Question 41

Logic behind attraction and repulsion

Answer 41

Attraction: Unlike charges attract Repulsion: Like charges repel

Question 42

When in balanced orbit, electrons move in spherical paths called...

Answer 42

Orbital shells

Question 43

The outermost orbital shell of an atom

Answer 43

Valence shell

Question 44

Capacity (number of electrons) per orbital shell

Answer 44

First: 2 Second: 8 Third: 18 Fourth: 32

Question 45

In this theory, electric current is electron flow.

Answer 45

Classical Theory: Flow of Electrons

Question 46

In this theory, electricity is tied to even smaller subatomic particles that possess either a positive or negative electromagnetic charge.

Answer 46

Modern Theory: Flow of Charged Particles

Question 47

Electricity from friction

Answer 47

Static electricity

Question 48

Electricity from heat

Answer 48

Thermoelectricity

Question 49

Electricity from pressure

Answer 49

Piezoelectricity

Question 50

Electricity from a chemical reaction.

Answer 50

Electrochemistry

Question 51

Electricity from light.

Answer 51

Photo electricity

Question 52

Electricity from magnetism

Answer 52

Magnetoelectricity

Question 53

Current flow in one direction in an electrical circuit.

Answer 53

Direct Current (DC)

Question 54

Continuous reversal of the direction of current flow.

Answer 54

Alternation Current (AC)

Question 55

Standard unit used in measuring the strenth of an electric current.

Answer 55

Amperage/Inductive Flow

Question 56

The driving force behind current flow.

Answer 56

Voltage/Electromotive Force

Question 57

Friction or opposition to the flow of current by the wired and transformers. Terms used in DC and AC...

Answer 57

Resistance DC: Friction AC: Impedance

Question 58

Factors that influences conductor resistance

Answer 58

Composition of the Conductor Length of Wire - the longer, higher resistance Cross Sectional Area of Wire - bigger, lower resistance Temperature

Question 59

What is Ohm's Law according to George Simon Ohm?

Answer 59

The higher the voltage, the higher the current, and the higher the resistance, the lower the current.

Question 60

The rate at which the work is accomplished

Answer 60

Power

Question 61

Define power factor

Answer 61

Measures how effectively the total delivered power is being used.

Question 62

Amount of work accomplished

Answer 62

Energy

Question 63

Flow or rate of electric force in a conductor

Answer 63

Electric Current

Question 64

the standard unit used in measuring the strength of an electric current

Answer 64

Amperage

Question 65

the driving force behind current flow

Answer 65

Voltage

Question 66

friction or opposition to the flow of current by the wires and transformers

Answer 66

Resistance

Question 67

continuous path along which an electric current can flow

Answer 67

electric circuit

Question 68

a simple circuit is composed of the following

Answer 68

power source, load, set of conductors, control device

Question 69

an uninterrupted path that allows continuous flow

Answer 69

closed circuit

Question 70

current flow is interrupted; the switch is opened

Answer 70

open circuit

Question 71

created if an inadvertent shortcut develops in a circuit; unintentional path

Answer 71

short circuit

Question 72

current passes without branching off; seldom used

Answer 72

series circuit

Question 73

if one load fails, the circuit remains closed; branching off

Answer 73

parallel circuit

Question 74

circuit components are series and/or parallel in some parts

Answer 74

combination circuits

Question 75

series circuit principles

Answer 75

shares the same amperage; total amperage is equal to the individual amperage

Question 76

total voltage in a series circuit

Answer 76

summation of individual voltages

Question 77

total resistance in a series circuit

Answer 77

summation of individual resistances

Question 78

parallel circuit principles

Answer 78

shares the same voltage; total voltage is equal to the individual voltages

Question 79

total amperage in a parallel circuit

Answer 79

summation of individual amperage

Question 80

total resistance in a parallel circuit

Answer 80

less than any individual resistances (inverse)