AREA III - Farm Electrification Flashcards
One of the most versatile and widely used forms of energy.
a. Wind
b. Electricity
c. Water
d. Geothermal
b. Electricity
Clouds driven by strong winds can gather huge electrostatic charges which are released to the earth in the form of lightning.
a. Chemical Action
b. Adiabatic reaction
c. Friction between moving objects
d. Cyclonic motion of objects
c. Friction between moving objects
Certain types of crystals produce a voltage when subjected to pressure.
a. Magnetism
b. Thermoelectricity
c. Photoelectricity
d. Piezoelectricity
d. Piezoelectricity
Voltage is produced when the junction of two unlike metals is heated.
a. Magnetism
b. Thermoelectricity
c. Photoelectricity
d. Piezoelectricity
b. Thermoelectricity
A material that uses the principle of thermoelectricity.
a. Thermal Conductors
b. Heat Insulator
c. Thermolinks
d. Thermocouples
d. Thermocouples
Solar or photo cells convert radiant energy to electrical energy.
a. Magnetism
b. Thermoelectricity
c. Photoelectricity
d. Piezoelectricity
c. Photoelectricity
Produces a voltage by operating on the principle of electromagnetic induction.
a. Magnetism
b. Thermoelectricity
c. Photoelectricity
d. Piezoelectricity
a. Magnetism
Smallest portion into which an element can be subdivided without losing its physical and chemical properties
a. Molecules
b. Atom
c. Carbon
d. Particle
b. Atom
Outermost electrons
a. Negatively-charged Electrons
b. Protons
c. Positively- charged Electrons
d. Valence Electrons
d. Valence electrons
if an object contains more number of total electrons than the total protons
Negatively charged
if an atom contains fewer number of total electrons than the total protons
Positively charged
the amount of electrical charge on a single electron
Elementary charge unit (ECU)
used to measure quantity of electric charge; approximately equal to 6.24 x 10^18 ECU.
Coulomb (C)
Defined as the rate at which electrical charge flows
a.
b.
c.
d.
Current
Causes electric charge to flow in an electrical system having potential difference
Electromotive force (emf)
Ability of a material to resist the flow of electrical charge when subjected to a given potential difference
Electrical Resistance
property of a material to oppose the flow of electric current
Resistivity
materials having an intermediate resistance to electron flow
Semiconductors
materials which has low resistance to electron flow
Conductors
materials which has high resistance to electron flow
Insulators
States that the current flowing in a circuit varies directly with the electrical pressure and inversely with the opposition
Ohm’s law
States that the sum of the current in a node must be equal to zero
Kirchhoff’s current law
The net voltage around a close circuit is zero
Kirchhoff’s voltage law
The common unit of electric power
Watt