DC Theory Flashcards
Engineering notation
Exponents will always be moved in increments of three. The coefficient is greater than or equal to one and less than 1000.
Tera
(T) 10^12 trillion times
Giga
(G) 10^9 billion times
Mega
(M) 10^6 million times
Kilo
(k) 10^3 thousand times
Milli
(m) thousandth of 10^-3
Micro
(miu) millionth of 10^-6
Nano
(n) billionth of 10^-9
Pico
(p) Trillionth of 10^-12
1,001,001,001,000.001001001001
1,001,001,001,000.001001001001
T. G. M. k. m. u. n. p
What is atomic theory
Matter is anything that occupies space, as weight (mass), or requires energy to move. Matter consists of various sized particles, known as molecules.
What is a molecule
A molecule is the smallest particle that a compound to be broken down into and still retain the properties of that compound
What is a compound
A compound results from the combination of two or more different elements
What are molecules made up of
Elements
What are elements made up of
Atoms
What is an atom
The smallest particle of an element that retains the characteristics of that element
What does an atom consist of
Electrons, protons, neutrons.
What are electrons
They are negatively charged particles.
What are protons
They are positively charged particles.
What are neutrons
They are neutral particles
What are the two heaviest particles of an Atom
Protons and neutrons, this is why we are found in the center of an Atom
What our valence electrons
Electrons found in orbit on the outermost ring, this causes the electron to require less energy to be “knocked out of orbit”
What is a valence ring
The outermost ring of an Atom where electrons travel
The further away from the nucleus that an electron is…
The less energy is required to “knock that electron out of its orbit”.
What is electromotive force
The influence that makes electrons move.
When one coulomb of charge exists, what is the electromotive force?
One volt
One coulomb is?
6.25E18 electrons
Letter for electromotive force and how it’s measured
E … In volts
Current and how it’s measured
The directed flow of electrons through a circuit. Amperes
Resistance and how it’s measured
Resistance to current flow. Measures in ohms
Conductance
Opposite of resistance. Measures in Siemens “s”. Symbol for conductance is G
Compositions of resistors
Carbon, wire wound, metal film, surface mount
Ohms law
E
I = __
R
LARS
Left add, right subtract
Ground connections
A common reference point in every circuit
Earth ground
To the earth
Chassis ground
Connected to an appliance or the bodywork of a car
Common
Subió usted yo represent a common return path
What is the voltage of a ground always assumed to be
Zero
I
E/R
E
IR
R
E/I
Learn about types of resistors
Learn about fuses and circuit breakers
Learn about variable resistors
Learn about the parts of a variable resistor
Measure current
Make a break fill a break
Measure resistance
De energize the circuit
