Chapter 4 Handout

Question 1

Primary function: to convert electric energy
into electromagnetic energy.

Answer 1

X-ray Imaging System

Question 2

The study of stationary electric charges

Answer 2

Electrostatics

Question 3

Matter has mass & energy equivalence. Matter also may have _____!

Answer 3

electric charge

Question 4

Fundamental Unit (SI) of Electric Charge:

Answer 4

coulomb (C)

Question 5

1 C = ???

Answer 5

6 x 10^18 electron charges

Question 6

The object that has too few or too many
electrons

Answer 6

Electrified

Question 7

• The process of adding or removing electrons from an object.
• It is created by contact, friction or by
  induction

Answer 7

Electrification

Question 8

The object that behaves as a reservoir for
stray electric charges.

Answer 8

Electric Ground

Question 9

Electric field radiate ___ from positive
charge; Electric field radiate ____ a negative charge

Answer 9

out ; toward

Question 10

What particles do not have electric
field?

Answer 10

Uncharged Particles

Question 11

The lines of force exerted on charged ions in the tissues by the electrodes.

Answer 11

Electric Field

Question 12

Positive charge: points _____
Negative charge: points _____

Answer 12

outward ; toward

Question 13

• The force of attraction between unlike
  charges or repulsion between like charges
• Directly proportional to the product of the charges
• Inversely proportional to the square of the distance between them

Answer 13

Electrostatic Force

Question 14

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

Answer 14

Coulomb’s Law

Question 15

Electric charge distribution is ______
throughout or on the surface!

Answer 15

uniform

Question 16

Electric charge of a conductor is concentrated along the __________.

Answer 16

the sharpest curvature of the surface!

Question 17

SI Unit of Electric Potential:

Answer 17

Volt (V)

Question 18

1 V:

Answer 18

1 J/C

Question 19

The study of electric charges in motion

Answer 19

Electrodynamics

Question 20

Work with electric current

Answer 20

Electrical Engineer

Question 21

Concerned with electron flow

Answer 21

Physicist

Question 22

Four States of Matter

Answer 22

Conductor, Insulator, Semiconductor,
Superconductor

Question 23

Any substance through which electrons flow easily

Answer 23

Conductor

Examples: copper (Z=29), aluminum (Z=13)
& water

Question 24

Any material that does not allow electron
flow

Answer 24

Insulator

Examples: glass, rubber & clay

Question 25

A material that some conditions behaves as an insulator & as a conductor

Answer 25

Semiconductor

Question 26

Any material that allows electrons to flow without resistance

Answer 26

Superconductor

Question 27

He demonstrated semiconduction

Answer 27

William Shockley (1946)

Question 28

The property of some matter to exhibit no resistance below a critical temperature

Answer 28

Superconductivity (1911)

Question 29

The path of electron flow from the generating source through the various components & back again

Answer 29

Electric Circuits

Question 30

Increasing electric resistance results in a reduced ______!

Answer 30

electric current

Question 31

The flow of electrons through a conductor

Answer 31

Electric Current/Electricity

Question 32

It is measured in ohms (Ω)

Answer 32

Electric Resistance

Question 33

It is measured in volts (V)

Answer 33

Electric Potential

Question 34

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

Answer 34

Ohm’s Law

Question 35

Two Basic Types of Electric Circuits

Answer 35

Series & Parallel Circuits