#1
Which wire color is typically used for the ground wire in electrical wiring?
Green
ExplanationGround wires are typically green to signify safety and grounding.
#2
What is the standard voltage for residential electrical outlets in the United States?
120V
ExplanationResidential outlets in the US typically supply power at 120 volts.
#3
What is the typical voltage used in residential electrical systems in the United States?
110 volts
ExplanationResidential systems in the US usually operate at around 110 volts.
#4
Which wire color is typically used for the neutral wire in electrical wiring?
White
ExplanationWhite wires are commonly used for neutral connections in electrical systems.
#5
What is the function of a ground wire in electrical wiring?
To carry fault currents safely to the ground
ExplanationGround wires protect against electrical faults by directing current away from circuits to the ground.
#6
Which electrical circuit is characterized by a single pathway for current to flow?
Series circuit
ExplanationSeries circuits have a single pathway for current, connecting components end-to-end.
#7
What is the purpose of a circuit breaker in an electrical system?
To interrupt current flow in case of overload
ExplanationCircuit breakers halt electrical current in case of overloads or faults, preventing damage or fires.
#8
Which of the following is NOT a type of electrical wiring commonly used in buildings?
Fiber optic wiring
ExplanationFiber optic wiring is not typically used for general electrical installations.
#9
What does the term 'NEC' stand for in the context of electrical standards?
National Electrical Code
ExplanationNEC stands for the National Electrical Code, a standard for safe electrical installation in the US.
#10
What is the main purpose of electrical conduit in wiring installations?
To provide mechanical protection to electrical cables
ExplanationConduit shields wires from physical damage and offers a secure pathway for wiring.
#11
Which of the following materials is commonly used as insulation for electrical wires?
Rubber
ExplanationRubber is a common insulator used to prevent electrical contact and ensure safety.
#12
Which of the following is a characteristic of a series circuit?
If one component fails, the entire circuit fails
ExplanationIn series circuits, failure of one component interrupts the flow of current throughout.