Effects of Electricity on the Human Body Quiz

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What is the primary objective of Chapter 4 in the Western Canada Mine Rescue Manual?

To outline the safety protocols for working with electrical systems

To educate rescuers on responding to emergencies involving electrical equipment (correct)

To provide guidelines for handling electrical installations in mines

To discuss the factors affecting severity of injuries caused by electrocution

What is the main reason behind many injuries and deaths due to exposure to electricity?

Moisture on the skin

Contact with low voltages

Partial insulation by dry clothing

High voltage and amperage (correct)

At what voltage do transmission lines typically operate?

500,000 volts to 1,000,000 volts

10,000 volts to 50,000 volts

50,000 volts to 100,000 volts

69,000 volts to 500,000 volts (correct)

What effect does moisture on the skin have on the body's resistance to electricity?

Decreases the body's resistance Signup and view all the answers

What is the purpose of stepping up voltage for efficient transmission over long distances?

To minimize energy loss during transmission Signup and view all the answers

What type of injuries can result from electrocution at heights?

A fall that can further injure the casualty Signup and view all the answers

How does contact with low voltages pose a danger?

It can lead to severe burns Signup and view all the answers

What factor lessens the effect of electricity when partially insulating the body with dry clothing?

The body's resistance to electricity Signup and view all the answers

What is the primary source of electricity generation mentioned in the manual?

Power plants Signup and view all the answers

What is one of the special considerations for emergencies involving electrical equipment?

Do not attempt rescue without proper training Signup and view all the answers

What is the force that causes the flow of electricity and is measured in volts?

Voltage Signup and view all the answers

Which unit is often used to express the difference in electrical potential for higher voltages?

Kilovolts Signup and view all the answers

What refers to a current flowing only from positive to negative?

Direct Current (DC) Signup and view all the answers

What is measured in ohms and is similar to the effect of friction on the flow of water in a pipe?

Resistance Signup and view all the answers

Which material conducts electricity in such small quantities that it cannot normally be detected?

Insulator Signup and view all the answers

What is the term for a sudden release of electrical energy bridging a gap between two conductors?

Arcing Signup and view all the answers

What causes loose connections and overloaded electrical conductors or motors to overheat?

Arcing Signup and view all the answers

Which unit of measurement is used for current and can be compared to the rate of water in a pipe?

Amperes Signup and view all the answers

What refers to when a current in a circuit reverses polarity or changes direction in current flow 60 times per second?

Alternating Current (AC) Signup and view all the answers

What is the process of mechanically connecting isolated wires and equipment to the earth, with sufficient capacity to carry the fault current?

Grounding Signup and view all the answers

What is the probable effect on the human body when exposed to a current of 1mA?

Slight tingling sensation Signup and view all the answers

At what current level does an average individual begin to lose muscular control and experience the freezing current or 'Can't let go' range?

Painful shock, begin to lose muscular control Signup and view all the answers

What is the effect on the human body when exposed to a current of 100mA–2000mA?

Death is likely Signup and view all the answers

What are the factors affecting the severity of injury when dealing with electrical emergencies?

Path of electricity through the body, degree of skin resistance, voltage, frequency AC/DC Signup and view all the answers

What can cause arcing or overheating of electrical equipment?

Wear or other deterioration, improper installation, inadequate maintenance Signup and view all the answers

What should be done if a fallen wire lies under a vehicle with occupants and the operator is unhurt and can move the vehicle?

Instruct the operator to move the vehicle clear of the wire and clear of any pools of water which may be energized by the live wire. Signup and view all the answers

What is a potential hazard for welders according to the text?

"Weld, Cut, or Braze" using electrical systems Signup and view all the answers

What is a major cause of fatalities for crane operators according to the text?

"Contact with overhead power lines" Signup and view all the answers

What should emergency personnel do if a fallen wire lies across a vehicle with occupants and the operator is injured and cannot move the vehicle?

Instruct occupants to stay where they are until electrical crews arrive. Signup and view all the answers

What precaution should operators of ground engagement tools take when trenching and excavating near buried power and communication lines?

Use lock-out/tag-out devices and establish an exclusion zone to eliminate the hazard Signup and view all the answers

What should rescue teams do when arriving at the scene of an incident involving power lines?

Stage response vehicles at a distance to avoid exposure to electrical hazards Signup and view all the answers

What should be established equal to the length of the distance between two poles in all directions from downed power lines?

An exclusion zone Signup and view all the answers

What should mine rescue teams ensure before conducting rescue operations during electrical emergencies?

That energy isolation is complete Signup and view all the answers

What action should be taken by personnel working near energy sources as per site-specific isolation procedures?

Guard against electrical shocks, burns, and eye injuries from electrical arcs Signup and view all the answers

What should be done to eliminate unauthorized access and prevent exposure to electrical hazards at an incident scene?

Control the incident scene Signup and view all the answers

What should be used when working near energy sources as per site-specific isolation procedures?

Lock-out/tag-out devices Signup and view all the answers

"Always assume that all electrical wires and equipment are energized until proven otherwise". What precaution does this statement emphasize?

"Always keep a safe distance from electrical wires and equipment" Signup and view all the answers

"Be aware that wire-mesh, chain-link, barbed wire, and steel-rail fences can be energized by wires outside of your field of view". What precaution does this statement highlight?

"Be aware and exercise caution around fences as they can conduct electricity" Signup and view all the answers

Why is it important to establish an exclusion zone equal to the length of the distance between two poles in all directions from downed power lines?

To prevent unauthorized access and exposure to electrical hazards Signup and view all the answers