Podcast
Questions and Answers
Which of the following options are conductors? (Select all that apply)
Which of the following options are conductors? (Select all that apply)
- Plastic
- Wet skin (correct)
- Water with small amounts of salt or other minerals (correct)
- Dry skin
Which of the following options are insulators? (Select all that apply)
Which of the following options are insulators? (Select all that apply)
- Pure water (correct)
- Metal
- Plastic (correct)
- Wet skin
What properties does a conductor have?
What properties does a conductor have?
Allows electrical current flow
Under which of the following circumstances would a person be shocked?
Under which of the following circumstances would a person be shocked?
Which factor increases the risk of injury if a person is shocked?
Which factor increases the risk of injury if a person is shocked?
What factors determine the severity of an electric shock?
What factors determine the severity of an electric shock?
Which type of wiring was most likely responsible for the fire caused by a mini-refrigerator?
Which type of wiring was most likely responsible for the fire caused by a mini-refrigerator?
What happens when a worker is in contact with energized sources while standing on a wet surface?
What happens when a worker is in contact with energized sources while standing on a wet surface?
What is an example of using extension/flexible cords improperly?
What is an example of using extension/flexible cords improperly?
What equipment does OSHA require employers to install to minimize electrocution hazards? (Select all that apply)
What equipment does OSHA require employers to install to minimize electrocution hazards? (Select all that apply)
Employers should attach tags to identify equipment or circuits being worked on while any worker is exposed to ____________ parts.
Employers should attach tags to identify equipment or circuits being worked on while any worker is exposed to ____________ parts.
How does a GFCI protect you?
How does a GFCI protect you?
Using a three-prong plug with a missing ground post is safe.
Using a three-prong plug with a missing ground post is safe.
Placing a plug into a wall receptacle with your hand on the plug is safe.
Placing a plug into a wall receptacle with your hand on the plug is safe.
It is safe to pull on a cord to remove a plug from a wall receptacle.
It is safe to pull on a cord to remove a plug from a wall receptacle.
What is an example of fixed wiring?
What is an example of fixed wiring?
What are examples of flexible wiring?
What are examples of flexible wiring?
What is the result of touching power lines or coming into contact with energized sources?
What is the result of touching power lines or coming into contact with energized sources?
OSHA's standards require your employer to ensure that lighting, equipment, motors, machines, appliances, and controls are constructed to _____________ electrical dangers.
OSHA's standards require your employer to ensure that lighting, equipment, motors, machines, appliances, and controls are constructed to _____________ electrical dangers.
What type of burn occurs when electrical current flows through tissues and generates heat?
What type of burn occurs when electrical current flows through tissues and generates heat?
What is the example provided when a client is undergoing therapy in a whirlpool unit plugged into an extension cord?
What is the example provided when a client is undergoing therapy in a whirlpool unit plugged into an extension cord?
What is the essential safety procedure that protects workers while working on or near electrical circuits?
What is the essential safety procedure that protects workers while working on or near electrical circuits?
Electrical circuits must be locked-out/tagged-out before electricians work on any equipment.
Electrical circuits must be locked-out/tagged-out before electricians work on any equipment.
What type of burn occurs when skin touches hot surfaces of energized equipment?
What type of burn occurs when skin touches hot surfaces of energized equipment?
What happens when electrical current leakage from the circuit occurs?
What happens when electrical current leakage from the circuit occurs?
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Study Notes
Conductors and Insulators
- Conductors allow electricity to flow easily; examples include metals, wet skin, and saltwater.
- Insulators resist electrical current; examples include pure water, plastic, and dry skin.
Electric Shock
- Electric shock occurs when a person becomes part of an electrical circuit.
- Risk of injury from electric shock increases with sweat on the skin.
Severity of Electric Shock
- Severity depends on four factors:
- Amount of current flowing through the body.
- Current's path through the body.
- Length of time in the circuit.
- Current's frequency.
Safety Hazards
- Major hazards include burns, electrocution, shocks, arc flashes, fires, and explosions.
- Contact with energized sources (e.g., bare wire on wet surface) poses serious risks.
Electrical Fires
- A building fire can result from faulty electrical wiring, as demonstrated by a mini-refrigerator's fire due to flexible wiring.
Proper Use of Electrical Equipment
- Extension cords should not be used for appliances like whirlpool units; they must be plugged into a GFCI receptacle.
OSHA Requirements
- Employers must construct and install safety equipment to minimize electrocution hazards (lighting, appliances, controls).
- Tags must identify equipment or circuits under maintenance, especially when exposed to live parts.
Ground Fault Circuit Interrupters (GFCI)
- GFCIs protect by detecting current leakage and cutting off electrical flow.
Electrical Safety Practices
- Using a three-prong plug without a ground is unsafe; pulling on a cord to unplug is also unsafe.
- It is safe to plug in a device using your hand on the plug.
Types of Burns
- Electrical burns occur when current flows through tissues, causing heat damage.
- Thermal contact burns occur from direct contact with overheated conductors or equipment.
Lockout/Tagout Procedures
- Lockout/Tagout is crucial for protecting workers from energized circuits during maintenance.
- Electrical circuits must be locked/tagged before work begins to ensure safety.
Electrical Circuit Components
- Fixed wiring includes electrical wires within walls.
- Flexible wiring encompasses extension cords and appliance cords.
Consequences of Contact with Power Lines
- Contact with power lines or energized sources can result in severe injuries or death.
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