Basic Electricity

Question 1

What is the most important rule? What are ways you can apply this rule?

Answer 1

Think, test it yourself, don’t depend on the circuit breaker, use gloves.

Question 2

Why should you work with one hand when possible with electricity?

Answer 2

To prevent a current from flowing between both hands and going through your heart.

Question 3

How many amperes is considered deadly?

Answer 3

.1- .2 amperes

Question 4

What type of protection equipment should you have?

Answer 4

Head protection, eye protection, ear protection, gloves, fire-retardant clothing, safety harness

Question 5

What does DC stand for and what directions does it flow?

Answer 5

Direct current, unidirectional

Question 6

What does AC stand for and what directions does it flow?

Answer 6

Alternating current, bidirectional, reverses flow

Question 7

What three elements are in an atom and what are their charges? Where are they all located.

Answer 7

Electron- negative, outside
Proton- positive, nucleus
Neutron- no charge, nucleus

Question 8

What is a valence electron?

Answer 8

Electrons located in the outer shell

Question 9

What is a conductor? How many valence electrons?

Answer 9

Material that permits electrons to flow easily. 1-3 valence electrons

Question 10

What is an insulator? How many valence electrons?

Answer 10

Material that resists the flow of electrons. 7 or 8 valence electrons

Question 11

What is a semiconductor? How many valence electrons?

Answer 11

Materials that aren’t good conductors or insulators. 4 valence electrons

Question 12

What is electricity or electrical current?

Answer 12

The flow of electrons

Question 13

What is the name, abbreviation, and variable for voltage?

Answer 13

Volts, V, E

Question 14

What is the name, abbreviation, and variable for current?

Answer 14

Amperes, A, I

Question 15

What is the name, abbreviation, and variable for resistance?

Answer 15

Ohms, Omega, R

Question 16

What is the name, abbreviation, and variable for power?

Answer 16

Watts, W, P

Question 17

What is a coulomb and how much is it?

Answer 17

A measure of charge, 6.25 x 10^18

Question 18

What are the three different names for voltage?

Answer 18

potential difference, electromagnetic force, electrical pressure

Question 19

What is a permanent magnet?

Answer 19

Magnet that does not require any power or force

Question 20

What is an electromagnet?

Answer 20

Magnet that depends on the electric current flow

Question 21

What are magnetic domains?

Answer 21

When molecules of a the metal align themselves in an orderly pattern

Question 22

What is ferromagnetic?

Answer 22

Metals that are easily magnetized

Question 23

What is paramagnetic?

Answer 23

Metals that can be magnetized

Question 24

What is diamagnetic?

Answer 24

Metals/ nonmetals that can’t be magnetized

Question 25

The strength of electromagnet is proportional to it’s ____

Answer 25

Ampere-turns

Question 26

What is permeability?

Answer 26

The measure a materials ability to be magnetized

Question 27

What is reluctance?

Answer 27

The resistance to magnetism

Question 28

What is saturation?

Answer 28

When the material reaches it’s maximum magnetic potential

Question 29

What is flux density?

Answer 29

measurement of magnetic strength

Question 30

What are the 3 ways to demagnetize something?

Answer 30

1. Placing an object in a strong AC electromagnetic field and then pulling it out
2. Striking the material to create a vibration that rearranges the molecules
3. Heating the material to a high temperature to rearrange the molecules

Question 31

What is a potentiometer?

Answer 31

A variable resistor used to provide a variable voltage

Question 32

What is a series circuit?

Answer 32

Circuit with only one path of current flow

Question 33

What are the 3 rules in a series circuit?

Answer 33

Current is constant (I)
Voltage is additive (E)
Resistance is additive (R)