Residential Electrician Quiz: 100 Questions

What is the primary purpose of using a Ground Fault Circuit Interrupter (GFCI) in residential wiring?

• To prevent circuit overloads

• To protect against electrical shock

• To reduce energy consumption

• To increase circuit capacity

Which of the following is a common color for a neutral wire in residential electrical systems?

• Red

• Black

• White

• Green

What is the formula to calculate electrical power in a circuit?

Which of the following is NOT a standard wire gauge size used in residential wiring?

• 12 AWG

• 14 AWG

• 10 AWG

• 8 AWG

What is the maximum allowable voltage drop for branch circuits in residential wiring according to the National Electrical Code (NEC)?

• 1%

• 3%

• 5%

• 10%

Which of the following is a common cause of electrical fires in residential settings?

• Overloading circuits

• Using LED bulbs

• Installing GFCI outlets

• Using surge protectors

What is the purpose of a circuit breaker in an electrical panel?

• To increase voltage

• To prevent circuit overloads

• To reduce current

• To enhance power factor

Which of the following is a requirement for installing electrical outlets in a bathroom according to the NEC?

• Must be on a 15-amp circuit

• Must be GFCI protected

• Must be installed at least 6 feet from the sink

• Must be on a dedicated circuit

What is the unit of electrical resistance?

• Ampere

• Volt

• Ohm

• Watt

Which of the following is a method for troubleshooting a non-functioning outlet?

• Check the circuit breaker

• Replace the light bulb

• Increase the circuit voltage

• Install a new outlet