Basic Physics and Electrical Safety

A 10-F capacitor is added by a Y-jumper to an already present 10-F capacitor. The new total capacitance is:

• 0 F

• 5 F

• 10 F

• 20 F

The threshold for induction of ventricular fibrillation is approximately:

• 10 A

• 1 A

• 100 mA

• 10 mA

Kirchhoff’s laws define the principle of:

• Dissipation of energy

• Conservation of energy

• Dissipation of resistances

• Conservation of resistance

Which of the following is true about a capacitor?

• Consists of two charged conductors separated by a resistor

• Is a device that stores a magnetic field

• Its charge q is inversely proportional to the potential difference

• Has a capacitance measured in Farad (F)

An inductor (coil) is defined by all of the following except:

• Generates a magnetic field when traversed by a current

• Has a property called inductance

• Is measured in seconds per ampere or Henry

• Facilitates a change in current flow

Electric shock is defined by all of the following except:

• Port of entry and exit

• Current source and ground, both connected to the body

• High resistance path

• Flow of current through the body

What is the maximal allowed leakage current in an intensive care unit (ICU) patient with a central venous pressure catheter?

• 100 mA

• 20 mA

• 100 μA

• 20 μA

A Y-jumper with a resistance of 10,000 Ω is added to an already present resistor of 10,000 Ω, the new total resistance is:

• 20,000 Ω

• 10,000 Ω

• 5,000 Ω

• 0 Ω

A requirement for a lethal shock is that the current pass through the:

• Brain

• Heart

• Chest

• All of the above

The voltage (V) is related to the current (I) and the resistance (R) by the equation:

• V = I/R

• V = R/I

• V = I x R

• V = 1/I + 1/R