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Self-Test 1 Q&A 3-3

Self-Test Questions Volume 1

Describe matter Any substance that has weight and takes up space
What cannot be broken down into a simpler substance using ordinary chemical means? Elements
Define molecule The smallest part of a substance that has all the characteristics of that substance
What are the elements that form molecules? Atoms
What type of charge does a proton carry? An electron? Protons carry a positive charge. Electrons carry a negative charge.
When is an atom considered electrically balanced? When the negative charge of the electron is equal to the positive charge of the proton.
Describe electrical current The uniform movement of electrons in a specific direction through a conductor (wire).
What is the term for an atom with eight electrons in the valence shell? Stable or balanced atom.
What type of charge does a normal atom that has lost one electron have? Positive
What is an atom that has gained an electron called? Negative ion.
The uniform movement of free electrons in a specific direction Current flow
6.28 x 10^18 electrical charges Coulomb
One coulomb passing a given point per second Ampere
Symbol for current used in equations I
Symbol for quantity of amperes A, a
List the four effects of electrons flowing through an electric circuit Heat, chemical change, magnetism, and physical shock.
Unit of measure for “electrical pressure.” Volt
The force which causes electrons to move from atom to atom Voltage or emf
The symbol “E” when used in formulas Voltage
Changes mechanical energy into electrical energy Generator
Changes heat energy into electrical energy Thermocouple
Unit of measure for all electrical opposition Ohm
"When 1 volt of pressure pushes 1 ampere of current flow through an electrical path, then 1 ohm of resistance is present" Ohm’s Law
“R.” The symbol for resistance in a math formula.
Name five factors that affect resistance Length of the conductor, Cross-sectional area of the conductor, Type of material the conductor is made of, Temperature, and Reactance.
The rate of doing work Power
“W” or “P.” “W” is the symbol for power in a drawing and “P” is the symbol for power in a math formula
Unit in which electrical motors are rated Horsepower
Number of watts per horsepower 746W
Unit in which generators and regulators are rated Watts
State the fundamental law of magnetism Like poles repel each other; unlike poles attract.
When do magnetic lines of force cross? Never
What action takes place when you place the south pole of one magnet near the south pole of another? They repel each other.
What surrounds all current-carrying conductors? Magnetic lines of force.
How can you strengthen the magnetic lines of force around a conductor? By forming a number of loops close together.
What three items are necessary to have an electromagnet? Coil of wire, core material, and current flow.
What type of core is preferred in the construction of relays and solenoids? Soft iron core
Uses the principle of electromagnetic induction. Produced by a machine called a generator. Requires a magnetic field, electric conductor, and relative motion. Mechanical Energy
Develops a difference of potential between two unlike materials. Two unlike materials placed in an electrolyte. Wet cell and dry cell. Chemical Energy
Direct current. Electrons flowing in one direction. Used in emergency lighting. Produced by a battery DC
Alternating current. Slip rings used in a generator produce it AC
Created by: RenegadeWolf
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