Unit 1

Question 1

The flow of electrons from an electronic source (through wires)

Answer 1

Electrical current

Question 2

A material opposes current flow

Answer 2

Resistor

Question 3

A device that stores electrical energy

Answer 3

Capacitor

Question 4

Opposition of biological tissues to the flow of electrical current

Answer 4

Impedance

Question 5

Flow of current in one direction

Answer 5

Direct current

Question 6

Flow fo current first in one direction then in the other direction (bidirectional)

Answer 6

Alternating current

Question 7

Synonymous with direct current

Answer 7

Monophonic

Question 8

Synonymous with alternating current

Answer 8

Biphasic

Question 9

Current flow in one direction

Answer 9

Phase

Question 10

Time period from beginning to end of one phase (leave isoelectric line until it returns)

Answer 10

Phase duration

Question 11

Time between phase

Answer 11

Interphase interval

Question 12

Time from isoelectric line untilmaximum amplitude

Answer 12

Phase rise

Question 13

Time from maximum amplitude until back at isoelectric line

Answer 13

Phase rise

Question 14

Time from maximum amplitude until back at isoelectric line

Answer 14

Phase decay

Question 15

Equal to phase duration for DC current and 2x phase duration for AC current

Answer 15

Phase duration

Question 16

Series of successive pulses or cycles over a period of time

Answer 16

Burst

Question 17

Time between beginning of 1st and end of last cycle or pulse

Answer 17

Phase duration

Question 18

Time between 2 successive bursts

Answer 18

Interburst duration

Question 19

The resulting current waveform when 2+ sinusoidal waves intersect (interfere) with each other

Answer 19

Beat

Question 20

Number of times per second that a pulse, cycle, burst, or beat occurs

Answer 20

Frequency

Question 21

Magnitude of current relative to the isoelectric slime measured in amperes. Usually in micro to milliamperes. Can be peak, peak-to-peak, average, or root mean square

Answer 21

Amplitude

Question 22

Continuous series of pulses, cycles, bursts or beats over time (usually seconds)

Answer 22

Train

Question 23

Ratio of on to off time expressed as a percentage

Answer 23

Duty cycle

Question 24

Time period where current amplitude is increasing from zero to maximum

Answer 24

Ramp up

Question 25

Time period where current amplitude is decreasing from maximum to zero

Answer 25

Ramp down

Question 26

Changes in amplitude, pulse duration, pulse frequency, or a combination of these to prevent nerve accommodation to stimulation

Answer 26

Modulation