Basic Electricity And Physics

Question 1

Resistors in series

Answer 1

R1+R2….

Question 2

Resistors In parallel

Answer 2

1/R=1/R1+1/R2

Remember to invert answer

Question 3

Relation of LFF and TC

Answer 3

LFF=1/TC

Question 4

Range for impedance in EEG

Answer 4

100-5000 ohms (omega sign) or 5kohms

Question 5

LFF (high pass) circuit

Answer 5

Made up of a capacitor in series and Develops potential/records across a resistor in parallel

Question 6

Ohm’s law

Answer 6

V=IR

Question 7

HFF(low pass) circuit

Answer 7

Made up of a resistor in series and Develops potential/records across a capacitor in parallel

Question 8

What happens if impedance is 50ohms

Answer 8

Salt bridge or short circuit due to low impedance, min 100 up to 5000

Question 9

Threshold for induction of V. Fib in normal person

Answer 9

100mA

Question 10

Currently applied directly to heart to cause V.Fib

Answer 10

0.1 mA or 10 uA

Question 11

Max ICU leakage current in ICU with CVP catheter

Answer 11

10-20 uA

Question 12

Nyquist theory

Answer 12

Sample at twice the highest recorded frequency

0-100 Hz needs 200 samples a second

Question 13

Resting potential K+

Nernst

Answer 13

• 100 mV

- 66mV

Question 14

Resting potential Na+

Nernst

Answer 14

+40 mV

+60mV

Question 15

Resting potential Cl-

Answer 15

-75 mV

Question 16

Resting potential Ca++

Answer 16

+124mV

Question 17

Resting potential of nerve

Answer 17

-70 mV

Question 18

Na/K ATPase

Answer 18

3Na in

2 K out

Question 19

Superficial EPSP vs deep

Answer 19

Surface negative vs surface positive

Question 20

To double signal to noise ration increase sweeps

Answer 20

4 square 2

Question 21

To limit drop in signal amplitude , amplifier impedance

Answer 21

100 X

Question 22

Higher display sensitivity or gain

Answer 22

Shorter onset latency longer duration

Question 23

To double signal to noise ration increase sweeps

Answer 23

4 square 2

Question 24

To limit drop in signal amplitude , amplifier impedance

Answer 24

100 X

Question 25

Higher display sensitivity or gain

Answer 25

Shorter onset latency longer duration