Electronics Technician || All Answers Are Correct 100%.
Who is credited with having been among the first to observe the attraction of amber for small
fibrous materials and bits of straw? correct answers Thales of Miletus (640-546 B.C.)
What is the Greek word for Ambera solidified tree sap? correct answers Elektron, (The root word
for electricity)
Who in the 17th Century announced the discovery that many substances could be electrified by
friction? correct answers Sir William Gilbert (1544-1603)
What is the name of Sir Williams Gilbert's book? correct answers De Magnete
all fundamental properties of electricity and magnetism can be traced to the state or motion of
what term? correct answers Electric charge
Who discovered that a glass rod and a wax rod possessed two different kinds of electrical
"fluid"? correct answers Charles F. DuFay (1698-1739)
In the eighteenth century,Who introduced the terms positive (+) and negative (-) to describe the
two types of electricity correct answers Benjamin Franklin (1706-1790)
In 1785, which physicist proved the laws of attraction and repulsion that exist between positive
and negative electric charges correct answers Charles Augustin de Coulomb (1736-1806)
What Law states that the force acting between two charges is directly proportional to the product
of the two charges and inversely proportional to the square of the distance between the charges
correct answers Coulomb's law
In 1786, who found that a frog's leg could be made to twitch if copper and iron were brought into
contact with a nerve and a muscle? correct answers Luigi Galvani
What did Luigi Galvani name his discovery involving the frogs leg? correct answers animal
electricity
In 1796, who proved that electricity could be produced if unlike metals separated by moistened
paper were brought into contact? correct answers Alessandro Volta
What arrangement became known as the voltaic pile? correct answers Alessandro Volta stacked
pairs of unlike metals on top of each other in order to increase the intensity of the electric charge.
This was the first battery
What was uncovered by Hans Christian Oersted in 1820? correct answers The first significant
connection between magnetism and electricity.Oersted accidentally discovered that a current-
carrying wire influenced the orientation of a nearby compass needle.
, What became known as electromagnetism? correct answers Magnetic fields to the motion of
electric charges
In 1826, What did German physicist Georg Simon Ohm observe? And what did this observation
become known as? correct answers The electrical resistance of metallic conductors remains
constant over wide ranges of potential difference. This observation became known as Ohm's law.
Two scientists are given credit for the discovery of electromagnetic induction. What are there
names? correct answers Michael Faraday (1791-1867), and Joseph Henry (1797-1878)
What are the laws of electromagnetic induction called? correct answers Faraday's laws
What as Gustav Kirchhoff well known for? correct answers His contributions to circuit theory
and the understanding of thermal emission, and also his significant discoveries in optics
Who considered an electrical network consisting of circuits joined at nodes of the network and
gave laws which reduce the calculation of the currents in each loop to the solution of algebraic
equations correct answers Gustav Kirchhoff
What year was the "Geissler tubes" developed? correct answers 1868
In a "Geissler tube" electrical discharges in rarefied gases would produce what? correct answers
Different colors
What is Sir William Crookes widely credited with? correct answers Being the inventor of the
first cathode ray tube
What did Thomas Edison discover when he inserted an electrode in a glass bulb with a filament?
correct answers He found that a current would flow if a positive potential was applied to the
electrode and the filament was hot. Edison also noted that no current would flow if the filament
was cold.
What led to the invention of the electronic vacuum tube? correct answers Thomas Edisons
incadescent light buld experiment with an electrode and a filament
What is the Fleming valve also known as? correct answers A vacuum-tube rectifier, or diode
What is to used to change alternating current into direct current. correct answers A fleming valve
(Also known as a vacuum-tube rectifier, or diode)
The first vacuum tube capable of boosting, or amplifying, small electrical signals was patented in
1907 by who? correct answers Lee de Forest
What type of vacuum tube used by Lee de Forest in 1907? correct answers A triode tube
Who is credited with having been among the first to observe the attraction of amber for small
fibrous materials and bits of straw? correct answers Thales of Miletus (640-546 B.C.)
What is the Greek word for Ambera solidified tree sap? correct answers Elektron, (The root word
for electricity)
Who in the 17th Century announced the discovery that many substances could be electrified by
friction? correct answers Sir William Gilbert (1544-1603)
What is the name of Sir Williams Gilbert's book? correct answers De Magnete
all fundamental properties of electricity and magnetism can be traced to the state or motion of
what term? correct answers Electric charge
Who discovered that a glass rod and a wax rod possessed two different kinds of electrical
"fluid"? correct answers Charles F. DuFay (1698-1739)
In the eighteenth century,Who introduced the terms positive (+) and negative (-) to describe the
two types of electricity correct answers Benjamin Franklin (1706-1790)
In 1785, which physicist proved the laws of attraction and repulsion that exist between positive
and negative electric charges correct answers Charles Augustin de Coulomb (1736-1806)
What Law states that the force acting between two charges is directly proportional to the product
of the two charges and inversely proportional to the square of the distance between the charges
correct answers Coulomb's law
In 1786, who found that a frog's leg could be made to twitch if copper and iron were brought into
contact with a nerve and a muscle? correct answers Luigi Galvani
What did Luigi Galvani name his discovery involving the frogs leg? correct answers animal
electricity
In 1796, who proved that electricity could be produced if unlike metals separated by moistened
paper were brought into contact? correct answers Alessandro Volta
What arrangement became known as the voltaic pile? correct answers Alessandro Volta stacked
pairs of unlike metals on top of each other in order to increase the intensity of the electric charge.
This was the first battery
What was uncovered by Hans Christian Oersted in 1820? correct answers The first significant
connection between magnetism and electricity.Oersted accidentally discovered that a current-
carrying wire influenced the orientation of a nearby compass needle.
, What became known as electromagnetism? correct answers Magnetic fields to the motion of
electric charges
In 1826, What did German physicist Georg Simon Ohm observe? And what did this observation
become known as? correct answers The electrical resistance of metallic conductors remains
constant over wide ranges of potential difference. This observation became known as Ohm's law.
Two scientists are given credit for the discovery of electromagnetic induction. What are there
names? correct answers Michael Faraday (1791-1867), and Joseph Henry (1797-1878)
What are the laws of electromagnetic induction called? correct answers Faraday's laws
What as Gustav Kirchhoff well known for? correct answers His contributions to circuit theory
and the understanding of thermal emission, and also his significant discoveries in optics
Who considered an electrical network consisting of circuits joined at nodes of the network and
gave laws which reduce the calculation of the currents in each loop to the solution of algebraic
equations correct answers Gustav Kirchhoff
What year was the "Geissler tubes" developed? correct answers 1868
In a "Geissler tube" electrical discharges in rarefied gases would produce what? correct answers
Different colors
What is Sir William Crookes widely credited with? correct answers Being the inventor of the
first cathode ray tube
What did Thomas Edison discover when he inserted an electrode in a glass bulb with a filament?
correct answers He found that a current would flow if a positive potential was applied to the
electrode and the filament was hot. Edison also noted that no current would flow if the filament
was cold.
What led to the invention of the electronic vacuum tube? correct answers Thomas Edisons
incadescent light buld experiment with an electrode and a filament
What is the Fleming valve also known as? correct answers A vacuum-tube rectifier, or diode
What is to used to change alternating current into direct current. correct answers A fleming valve
(Also known as a vacuum-tube rectifier, or diode)
The first vacuum tube capable of boosting, or amplifying, small electrical signals was patented in
1907 by who? correct answers Lee de Forest
What type of vacuum tube used by Lee de Forest in 1907? correct answers A triode tube
