2. Electricity

Question 1

the study of stationary electric charges

Answer 1

Electrostatics

Question 2

the study of electric charges in motion

Answer 2

Electrodynamics

Question 3

can be created by contact, friction, or induction

Answer 3

Electrification

Question 4

is due to the movement of negative electric charge

Answer 4

Electrification

Question 5

the smallest unit of electric charge is the _____

Answer 5

electron

Question 6

the fundamental unit of electric charge is _____

Answer 6

coulomb (C)

Question 7

1 C = ____ electron charges

Answer 7

6.3x10^18 electron charges

Question 8

unlike charges attract; like charges repel

Answer 8

Electrostatic Laws

Question 9

The electrostatic force is directly proportional to the product of the electrostatic charges and inversely proportional to the square of the distance between them

Answer 9

Coulombs’ Law

Question 10

Unit of Force

Answer 10

N (Newton)

Question 11

Unit of Charges

Answer 11

Coulomb (C)

Question 12

Electric Potential is sometimes called

Answer 12

voltage

Question 13

the unit of electrical potential is the

Answer 13

volt (V)

Question 14

is potential energy/ unit of charge, or a joule/coulomb (J/C)

Answer 14

volt

Question 15

flow of electrons in conductor (Electricity)

Answer 15

Electric Current

Question 16

measured in amperes (A)

Answer 16

Electric Current

Question 17

is proportional to the number of electrons flowing in the electric circuit

Answer 17

ampere

Question 18

is equal to an electric charge of 1 C flowing through a conductor each second

Answer 18

one ampere,

1 A = 1 C/s

Question 19

2 TYPES OF CURRENT

Answer 19

• DC

- AC

Question 20

Electrons flowing only in one direction

Answer 20

DC

Question 21

Electrons flowing alternately in opposite direction

Answer 21

AC

Question 22

is measure in ohms (Ω)

Answer 22

Electric resistance

Question 23

is a passive two terminal electrical component that implements electrical resistance as a circuit element

Answer 23

Resistor

Question 24

in electronics circuits, it is often used to limit current flow, to adjust signal levels, bias active elements, and terminate transmission lines among other uses

Answer 24

Resistor

Question 25

is any substance through which electrons flows easily

Answer 25

Conductors

Question 26

Copper (Cu), Aluminum (Al), water

Answer 26

Conductors

Question 27

is any material that does not allow electron flow

Answer 27

Insulators

Question 28

glass, clay other earthlike material, rubber

Answer 28

Insulators

Question 29

is a material that under some conditions behave as an insulator and in other conditions behaves as a conductor

Answer 29

Semiconductors

Question 30

In ______ , _______ demonstrated semi conduction

Answer 30

1946, | William Shockley

Question 31

Silicon (Si) - 14, Germanium (Ge) - 32

Answer 31

Semiconductors

Question 32

is the property of some materials to exhibit no resistance below a critical temperature (Tc)

Answer 32

Superconductivity

Question 33

Niobium (41), Titanium (22)

Answer 33

Superconductivity

Question 34

Superconductivity Discovered in _____, commercially available in _____

Answer 34

1911, | 1960s

Question 35

when the resistance is controlled and the conductor is made into a closed path, the result is an

Answer 35

Electric Current

Question 36

the voltage across the total circuit or any portion of the circuit is equal to the current times the resistance

Answer 36

Ohm’s Law

Question 37

Ohm’s Law

Answer 37

V = IR

Question 38

all circuit elements are connected in a line along the same conductor

Answer 38

Series circuit

Question 39

contains elements that are connected at their ends rather than lie in a line along a conductor

Answer 39

Parallel circuit

Question 40

RULES FOR SERIES CIRCUITS

Answer 40

1. The total resistance is equal to the sum of the individual resistances (RT = R1 + R2 + R3) 2. The current through each circuit elements is the same and is equal to the total circuit current voltage (IT = I1 = I2 = I3) 3. The sum of the voltages across each circuit element is equal to the total circuit voltage (VT = V1 + V2 + V3)

Question 41

RULES FOR PARALLEL CIRCUITS

Answer 41

1. The sum of the currents through each circuit element is equal to the total circuit current (IT = I1 + I2 + I3) 2. The voltage across each circuit element is the same and is equal to the total circuit voltage (VT = V1 = V2 = V3) 3. The total resistance is the inverse of the sum of the reciprocals of each individual resistance (1/RT = 1/R1 + 1/R2 + 1/R3)

Question 42

is measured in watts (W)

Answer 42

Electric Power

Question 43

is equal to 1 A current flowing through an electric potential of 1 V

Answer 43

one watt, | 1 W = 1 A + 1 V

Question 44

in an electric power system, is any abnormal electric current

Answer 44

Electric Fault (Fault or Fault Current)

Question 45

is any failure that allows unintended connection of power circuit conductors with the earth

Answer 45

Ground Fault (Earth Fault)

Question 46

provides an alternate path for electricity to follow, rather than going through a person

Answer 46

Electrical Grounding

Question 47

happens when current passes through the body

Answer 47

Electrical Shock

Question 48

refers to the injury or lethal dose of electrical energy

Answer 48

Electrocution

Question 49

Electrical fires may be caused by excessive resistance that generates heat from any of the following:

Answer 49

* Too much current running through wiring where overcurrent protection fails or does not exist * Faulty electrical outlets resulting in poor contact or arcing * Poor wiring connections and old wiring that is damaged and cannot support the load

Question 50

can occur when electricity ignites a flammable gas or combustible dust mixture in the air. Ignition from a short circuit or static charge is possible

Answer 50

Explosion

Question 51

is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected

Answer 51

Circuit breaker

Question 52

a device that shuts off power instantly if there is a problem

Answer 52

Ground Fault Circuit Interrupter (GCFI)

Question 53

GFCI

Answer 53

Ground Fault Circuit Interrupter

Question 54

Its basic function is to interrupt current flow after a fault is detected

Answer 54

Circuit breaker