Instrumentation|Electronics Flashcards
What is Ohm’s Law?
Voltage (V) = Current (I) x Resistance (R)
What is the Nyquist Theorem?
Sampling rate of an EEG amplifier should be at least 2x the highest frequency being recorded.
What is the sampling rate of most EEGs?
256 samples per second
What is aliasing?
Distortion that occurs when the sampling rate is too low to be reconstructed into its actual form
What is alternating current?
Electrical current that periodically reverses direction.
Household sockets are an example of what type of current?
Alternating
EEG originates as a ______ current but emerges as a ______ current.
direct; alternating
What word describes rate of electron flow or current?
Amperage
What is amperage?
Rate of electrical flow (electrons) or current (i.e., quantity of electrical charge).
Amperage is measured in what units?
Amps (Amperes)
What defines 1 amp/ampere?
The number of coulombs of electrical charge that travel through a conductor per second.
What defines a wave’s amplitude?
Deviation from resting state (distance between baseline and crest or trough).
Amplitude is a measure of a wave’s ______.
power
Amplitude is measured in _______.
millivolts (mV)
A millivolt (mV) is equivalent to ______ volts.
one one-thousandth (1/1000)
What is capacitance?
The ability of a system to store an electrical charge
Static shock is an example of ______.
Capacitance
Capacitance is measured in what units?
Microfarads (mfd)
What is coherence?
Co-variation of phase between a pair of signals at a specific frequency
What word describes co-variation of phase between a pair of signals at a specific frequency?
Coherence
What is direct current?
Current that only flows in one direction
Current that only flows in one direction is called what?
Direct current
Current that reverses direction is called what?
Alternating current
What term describes which frequency within a component band has the greatest share of voltage or power?
Dominant frequency