ALL EXAm 3 Questions & Answers
Correct!!
Although understanding principles of Electricity is difficult, knowing principles helps you
understand what? - ANSWERShow electricity affects us therapeutically
History of electricity? - ANSWERS• Greeks first to name and record electrical
phenomenon
• Thales (624-546 BC)
The Atom
1. What does atoms make up?
2. What is the structure of an atom?
3. What is the diameter of an atom?
4. Where is most of the mass? - ANSWERS1. All matter on Earth consists of atoms
(population of about 7 billion)
2. Structure- electrons orbit center of protons/neutrons
3. Has a diameter of about 10 ^ -10 m ( one-billionth of a meter) & Nucleus diameter
only 10 ^ -14 m (10,000 times smaller than atom size)
4. Mass mostly in the center (think of mass of proton/neutron as big as a baseball &
electron one grain of rice)
What is electricity?
1. Positive atoms (cations) want what?
,2. So what do electrons do/want?
3. AKA big idea? - ANSWERS1. want negative electrons so they can be BALANCED
(positive will attract negative)
2. So electrons will MOVE from one positive atom to another & electrons ALSO want to
be part of a balanced atom too!!! (negative has a strong attraction on positive)
3. AKA OPPOSITES ATTRACT!!!
What is electricity?
Propagation of Electrical Current:
1. What are the five steps of the flow of electricity?
2. When electrons move, a what is created? - ANSWERSFlow of Electricity:
1. An atom (with electrons on the outside and nucleus/protons/neurons in the middle)
2. Electrons enters
3. One electron flies to the next atom
4. One electron flies to the next atom
5. electrons fly on
* When electrons move, a CURRENT of electricity is created*
Ampere
1. Definition?
2. Amps? (Coulomb?) - ANSWERS1) RATE at which electrical current flows
2) Amps: is the term for the amount of current flowing through the wire in a given time
*Coulomb -> 1 amp = 1 coulomb = 6.25 x 10 ^18 electrons per second
Voltage
1) what is it?
2) volt?
3) in a foist what is the voltage? - ANSWERS1. the electromotive FORCE &
DIFFERENCE in electron potential between two points
2. Volt: term for pressure in the line causing the current flow
,3. The water pressure!!!
Watt
1) what is it? - ANSWERS1) rate at which electrical power is being USED & product of
FLOW and FORCE
Compare Amps and Volts and Watts
1) in terms
2) equation? - ANSWERS1) Amperage is a measure of the AMOUNT of electricity used
& Voltage measures the pressure/FORCE of electricity & Watts is a measure of WORK
that electricity does per second
2) w = A x V
w- watts
A- amps
V- volts
Ohm (Ω)
1) what does it measure?
2) what is an ohm?
3) what is ohm's law? - ANSWERS1. measures of electrical RESISTANCE
2) ohm-> the unit of measurement indicating the amount of resistance applied to the
flow of current
3) ohm's law -> current through a conductor (between two points) is directly proportional
to the potential differences across the two points
I = V/R
I - electrical current
V- voltage
R- resistance
Generator
1) what is it?
, 2) how it relates to electrical modalities? - ANSWERS1) device that CONVERTS an
input electrical current into an output electrical current
2) take electric current flowing from wall outlet and modify current to produce specific,
desired physiological effect in human biological tissue
Terminal (Pole)
1) what is it?
2) how many and what are they?
3) electrical currents? - ANSWERS1) OUTPUT part of generator
2) TWO terminals must be paired for complete circuit: Positive terminal (LOW
concentration of electrons) & Negative terminal (HIGH concentration of electrons)
3) electrical currents- allows electrons to move between two poles of a generator
Overall: To have a current you need what three things? - ANSWERS1) a source of
electrons
2) a material that allows passage of electrons (AKA a conductor/conduit)
3) a driving force of electrons (AKA the voltage)
What are the three basic forms of an output current? - ANSWERS1) Direct (DC)
2) Alternating (AC)
3) Pulsed Current
Direct Current (DC)
1. what is it?
2. example? - ANSWERS1. is a current that always flows in SAME direction and may
flow in either a positive or negative direction
2) Battery and Light bulb circuit: when does a battery die? -> electrons flow from
negative pole to positive pole -> number of electrons at negative pole equals number of
electrons at positive pole no potential for current flow exists -> battery dies
Alternating Current (AC)
1. what is it?
Correct!!
Although understanding principles of Electricity is difficult, knowing principles helps you
understand what? - ANSWERShow electricity affects us therapeutically
History of electricity? - ANSWERS• Greeks first to name and record electrical
phenomenon
• Thales (624-546 BC)
The Atom
1. What does atoms make up?
2. What is the structure of an atom?
3. What is the diameter of an atom?
4. Where is most of the mass? - ANSWERS1. All matter on Earth consists of atoms
(population of about 7 billion)
2. Structure- electrons orbit center of protons/neutrons
3. Has a diameter of about 10 ^ -10 m ( one-billionth of a meter) & Nucleus diameter
only 10 ^ -14 m (10,000 times smaller than atom size)
4. Mass mostly in the center (think of mass of proton/neutron as big as a baseball &
electron one grain of rice)
What is electricity?
1. Positive atoms (cations) want what?
,2. So what do electrons do/want?
3. AKA big idea? - ANSWERS1. want negative electrons so they can be BALANCED
(positive will attract negative)
2. So electrons will MOVE from one positive atom to another & electrons ALSO want to
be part of a balanced atom too!!! (negative has a strong attraction on positive)
3. AKA OPPOSITES ATTRACT!!!
What is electricity?
Propagation of Electrical Current:
1. What are the five steps of the flow of electricity?
2. When electrons move, a what is created? - ANSWERSFlow of Electricity:
1. An atom (with electrons on the outside and nucleus/protons/neurons in the middle)
2. Electrons enters
3. One electron flies to the next atom
4. One electron flies to the next atom
5. electrons fly on
* When electrons move, a CURRENT of electricity is created*
Ampere
1. Definition?
2. Amps? (Coulomb?) - ANSWERS1) RATE at which electrical current flows
2) Amps: is the term for the amount of current flowing through the wire in a given time
*Coulomb -> 1 amp = 1 coulomb = 6.25 x 10 ^18 electrons per second
Voltage
1) what is it?
2) volt?
3) in a foist what is the voltage? - ANSWERS1. the electromotive FORCE &
DIFFERENCE in electron potential between two points
2. Volt: term for pressure in the line causing the current flow
,3. The water pressure!!!
Watt
1) what is it? - ANSWERS1) rate at which electrical power is being USED & product of
FLOW and FORCE
Compare Amps and Volts and Watts
1) in terms
2) equation? - ANSWERS1) Amperage is a measure of the AMOUNT of electricity used
& Voltage measures the pressure/FORCE of electricity & Watts is a measure of WORK
that electricity does per second
2) w = A x V
w- watts
A- amps
V- volts
Ohm (Ω)
1) what does it measure?
2) what is an ohm?
3) what is ohm's law? - ANSWERS1. measures of electrical RESISTANCE
2) ohm-> the unit of measurement indicating the amount of resistance applied to the
flow of current
3) ohm's law -> current through a conductor (between two points) is directly proportional
to the potential differences across the two points
I = V/R
I - electrical current
V- voltage
R- resistance
Generator
1) what is it?
, 2) how it relates to electrical modalities? - ANSWERS1) device that CONVERTS an
input electrical current into an output electrical current
2) take electric current flowing from wall outlet and modify current to produce specific,
desired physiological effect in human biological tissue
Terminal (Pole)
1) what is it?
2) how many and what are they?
3) electrical currents? - ANSWERS1) OUTPUT part of generator
2) TWO terminals must be paired for complete circuit: Positive terminal (LOW
concentration of electrons) & Negative terminal (HIGH concentration of electrons)
3) electrical currents- allows electrons to move between two poles of a generator
Overall: To have a current you need what three things? - ANSWERS1) a source of
electrons
2) a material that allows passage of electrons (AKA a conductor/conduit)
3) a driving force of electrons (AKA the voltage)
What are the three basic forms of an output current? - ANSWERS1) Direct (DC)
2) Alternating (AC)
3) Pulsed Current
Direct Current (DC)
1. what is it?
2. example? - ANSWERS1. is a current that always flows in SAME direction and may
flow in either a positive or negative direction
2) Battery and Light bulb circuit: when does a battery die? -> electrons flow from
negative pole to positive pole -> number of electrons at negative pole equals number of
electrons at positive pole no potential for current flow exists -> battery dies
Alternating Current (AC)
1. what is it?
