I-L. Patient safety / Electrical safety

Question 1

Life-threatening current could pass through a patient if
A) the machine ground is not intact
B) electrodes of differing metals are used
C) the common mode rejection ratio is high
D) impedances are not balanced

Answer 1

the machine ground is not intact.

Question 2

Which of the following is the most closely related to the measurement of voltage in relation to current and resistance?
A) Ohm’s law
B) Paley-Winer therorem
C) Coulombs law
D) Nyquist theory

Answer 2

Ohm’s law

Question 3

Avoid the use of this in EEG because it may increase the capacitive current to a potentially dangerous amount.
A) Non-cephalic electrodes
B) Common ground
C) Extension cord
D) Ohm meter

Answer 3

Extension cord

Question 4

What type of electricity provides a steady source of current, flowing in one direction only?
A) Direct current
B) Alternating Current
C) Magnetism
D) Ampere

Answer 4

Direct current