Unit 1 Flashcards
Everything in the universe is made up of…
Matter
What is the smallest unit a compound can be broken down into without changing characteristics of the compound?
Molecule
What is the purest part of a substance that can be broken down and retains its properties as that element?
Element
What are the three parts of an atom?
Proton, Neutron and Electron
How many free electrons do conductors have in the valence shell?
1 to 3
In contrast to good conductors, we consider substances that have how many free electrons to be insulators?
5 to 8
Semiconductors are not good conductors or insulators and are made of substances that have how many free electrons?
4
What symbol do we commonly use to represent resistance?
Greek letter Omega.
When it comes to resistance in a piece of wire, what does a smaller surface area cause?
Higher Resistance
What type of voltage normally maintains the same magnitude, but may vary?
Direct Current
What type of voltage continually changes magnitude and occasionally changes direction?
Alternating current
Ohm’s Law describes the relationship between
Voltage, Current and Resistance
What is the relationship of current based on Ohm’s Law?
Inversely proportional to voltage and directly proportional to resistance.
What device allows you to control a direct current (DC) circuit manually?
Switch
Which direct current (DC) circuits have only one path for electron flow?
Series
What method of calculating total resistance of a parallel circuit only works when calculating two resistors?
Product over Sum method
What type of direct current (DC) circuit has more than one path for current to flow but have at least one resistor that receives the total circuit current passing through it?
Series-Parallel Circuit
What is the characteristic for total power in a series parallel circuit?
Sum of the power at each individual resistor
What type of circuit typically has a parallel circuit with one or more legs having series portions?
Combination circuit
When you hear about the frequency of electricity, it refers to the number of complete cycles that occur in
1 second
