Midterm Flashcards
(36 cards)
What is charge?
The excess or deficiency of elctrons or ions.
What is a negative charge?
A neutral substance that gains electrons.
What is polarity?
The property of 2 opposite charged poles. Free electrons flow from excess electrons to an area of deficiency of electrons.
What is cathode and anode?
Cathode- the negative pole. Anode - is the positive pole.
What is current?
The flow of charged particles past a specific point in a specified direction.
What are the 2 types of currents and what are they each aka?
Direct current aka DC aka monophasic. Alternating current aka AC aka biphasic.
What is DC and AC like?
DC- current flows between positive and negative poles in one direction only. AC- Current periodically changes its direction of flow between a positive and negative pole.
What is pulsed current?
A non-continuous, interrputed, or periodic flow of DC or AC. DC- Pulse. AC- cycle.
What is frequency?
The rate or number of cycles per second or pulses per second.
What is intensity?
the strength of the current.
What is milliamp?
One thousdanth of an amp. Amp- a unit of current or the number of electrons flowing per second.
What is a microamp?
One one-millionth of an ampere.
What is volt?
The unit of electromotive force. What drives the Amps (electrons) along a conductor.
What is resistance?
A property of a conductor that characterizes its opposition to the movement of charged particles.
What is an OHM?
A unit of resistance. One ohm allows 1 ampere to flow under an electrical potential difference of one volt.
What is Coulomb’s law?
Like charges repel and unlike charges attract.
What is Joule’s law?
Electrical currents cause a rise in temperature due to conversion of electrical energy into heat.
What is Ohm’s law?
The flow of a current is directly proportional to the electromotive force (voltage) of the generator and inversely proportional to the resistance in the curcuit. SO take 1 volt to push 1 ampere through 1 ohm or V= IxR where I=amperage.
What are the modes of electrotherapy delivery?
- Continuous. 2. Pulsed.
What are the type of phases of electrotherapy?
Monophasic, biphasic, polyphasic.
What is pulse duration?
The width of the pulse or the length of time from beginning to end of all phases within a pulse or cycle.
What are the 2 type of pulse durations and what will they effect more?
Wide-motor. Narrow- sensory.
What is phase rise time?
The time elapsed from point when phase leaves zero baseline to when it reaches peak amplitude.
What are the different types of phase rise times and what will they effect?
fast- causes nerve depolarization and reduce nerve accomodation. Slow- Causes nerve accomodation and no action potential.
