PTA145 Unit 4 Review 1

Ohm's Law is:

• Current flow is directly proportional to voltage

• Current flow is directly proportional to electricity

• Current flow, does not flow

• All are correct

What is Impedance?

• The position of flow of energy

• The opposition to current flow in the body

• The opposition to deeper layers

• All are correct

Impedance increases and is affected by:

• Edema, ischemia, atherosclerosis, scarring and denervation

• Bones, tendons and fascia

• Large areas and small areas equally

• None are correct

What is capacitance?

• Is the same as capacity

• Ability to repel charge in an electric field

• abillity to store charge in an electric field

• all are correct

Is common to get a small degree of erythema noted on skin under electrodes after E-Stim application of D.C. because?

• Chemical reactions can be irritating to the skin

• Electrodes are electric

• Chemical reactions did not occur

• Only A and C

Classification of current:

• There is not classification

• Minimal and maximal current

• AB

  CD

  Pulsed current

• DC

  AC

  Pulsed Current

What are the characteristics of Biphasic wave form

• Biphasic have two phases

• Biphasic has not phases

• Is like monophasic

• All are correct

Constant current stimulator

• The voltage increases when resistance increases.

• The voltage increases to maintain the same level of current when the resistance increases

• Similar to constant voltage stimulator

• The opposite to constant voltage stimulator

What is direct current?

• There is accumulation of current

• All the currents are the same

• Continuous bidirectional flow of charged particles with a duration of at least 1 sec

• Continuous unidirectional flow of charged particles with a duration of at least 1 sec.

What is alternating current?

• The charged current never stops

• A continuous bidirectional flow of charged particles changing direction at least once per second.

• An interrupted bidirectional flow of charged partcles changing direction at least once per second.

• The charged current never occurs