ETC Electrical & Electronic Systems Flashcards
6 cards from real ETC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 ETC Electrical & Electronic Systems flashcards as text
What is the standard US residential single-phase voltage supplied to most homes?
Answer: 120/240 V
US residential service is single-phase 120/240 V, providing 120 V for general outlets and 240 V for large appliances.
Which electrical code governs the installation of electrical wiring and equipment in the United States?
Answer: NFPA 70 (NEC)
NFPA 70, the National Electrical Code (NEC), is the primary standard for safe electrical installation in the US.
In Ohm's Law, if a circuit has a voltage of 120 V and a resistance of 60 ohms, what is the current?
Answer: 2 A
Ohm's Law states I = V/R; 120 V divided by 60 ohms equals 2 A.
What does GFCI stand for in electrical safety?
Answer: Ground Fault Circuit Interrupter
A Ground Fault Circuit Interrupter detects imbalances in current flow and quickly shuts off power to prevent electrocution.
What is the purpose of a disconnect switch in an electrical panel?
Answer: To safely de-energize a circuit for maintenance
A disconnect switch allows a technician to safely isolate and de-energize a circuit before performing maintenance.
Which wire color in standard US wiring indicates the neutral conductor?
Answer: White
In US standard wiring, white identifies the neutral conductor, while black or red are hot and green is ground.