Basic Electricity Flashcards
What is the most important rule? What are ways you can apply this rule?
Think, test it yourself, don’t depend on the circuit breaker, use gloves.
Why should you work with one hand when possible with electricity?
To prevent a current from flowing between both hands and going through your heart.
How many amperes is considered deadly?
.1- .2 amperes
What type of protection equipment should you have?
Head protection, eye protection, ear protection, gloves, fire-retardant clothing, safety harness
What does DC stand for and what directions does it flow?
Direct current, unidirectional
What does AC stand for and what directions does it flow?
Alternating current, bidirectional, reverses flow
What three elements are in an atom and what are their charges? Where are they all located.
Electron- negative, outside
Proton- positive, nucleus
Neutron- no charge, nucleus
What is a valence electron?
Electrons located in the outer shell
What is a conductor? How many valence electrons?
Material that permits electrons to flow easily. 1-3 valence electrons
What is an insulator? How many valence electrons?
Material that resists the flow of electrons. 7 or 8 valence electrons
What is a semiconductor? How many valence electrons?
Materials that aren’t good conductors or insulators. 4 valence electrons
What is electricity or electrical current?
The flow of electrons
What is the name, abbreviation, and variable for voltage?
Volts, V, E
What is the name, abbreviation, and variable for current?
Amperes, A, I
What is the name, abbreviation, and variable for resistance?
Ohms, Omega, R
What is the name, abbreviation, and variable for power?
Watts, W, P
What is a coulomb and how much is it?
A measure of charge, 6.25 x 10^18
What are the three different names for voltage?
potential difference, electromagnetic force, electrical pressure
What is a permanent magnet?
Magnet that does not require any power or force
What is an electromagnet?
Magnet that depends on the electric current flow
What are magnetic domains?
When molecules of a the metal align themselves in an orderly pattern
What is ferromagnetic?
Metals that are easily magnetized
What is paramagnetic?
Metals that can be magnetized
What is diamagnetic?
Metals/ nonmetals that can’t be magnetized
The strength of electromagnet is proportional to it’s ____
Ampere-turns
What is permeability?
The measure a materials ability to be magnetized
What is reluctance?
The resistance to magnetism
What is saturation?
When the material reaches it’s maximum magnetic potential
What is flux density?
measurement of magnetic strength
What are the 3 ways to demagnetize something?
- Placing an object in a strong AC electromagnetic field and then pulling it out
- Striking the material to create a vibration that rearranges the molecules
- Heating the material to a high temperature to rearrange the molecules
What is a potentiometer?
A variable resistor used to provide a variable voltage
What is a series circuit?
Circuit with only one path of current flow
What are the 3 rules in a series circuit?
Current is constant (I)
Voltage is additive (E)
Resistance is additive (R)
