{"id":"electrician-free","timeLimitSec":1238,"questions":[{"id":"elf-001","section":"theory","q":"A 24-ohm resistive load is connected to 120 volts. How much current flows?","options":["10 A","2.5 A","5 A","0.2 A"],"answer":2,"explain":"Ohm's law: I = E / R = 120 / 24 = 5 amperes."},{"id":"elf-002","section":"calc","q":"A 16 A load is fed by a 2-wire circuit whose two conductors have a total resistance of 0.25 ohms. What is the voltage drop?","options":["8 V","64 V","0.25 V","4 V"],"answer":3,"explain":"Voltage drop = I x R of the conductors = 16 x 0.25 = 4 volts."},{"id":"elf-003","section":"wiring","q":"What does the ampacity of a conductor describe?","options":["The maximum voltage its insulation can withstand before breaking down","The current it can carry continuously without exceeding its temperature rating","Its resistance per 1,000 feet","The current that trips its breaker"],"answer":1,"explain":"Ampacity is the current a conductor can carry continuously under its conditions of use without going above its temperature rating."},{"id":"elf-004","section":"ground","q":"What is the main purpose of bonding metal parts together?","options":["To ensure electrical continuity so fault current can flow safely","To reduce the voltage of the supply","To carry the normal return current of the circuit","To connect the whole system to the earth so lightning and surges are drawn away"],"answer":0,"explain":"Bonding connects metal parts so they form a continuous, conductive path. Grounding is the connection to the earth."},{"id":"elf-005","section":"safety","q":"Before touching conductors that were switched off, what is the correct way to verify they are de-energized?","options":["Test a known live source, test the conductors, then test the known source again","Check that the breaker handle is off and the panel schedule matches the circuit","Check that the breaker handle is in the off position","Ask a coworker whether the circuit is off"],"answer":0,"explain":"This live-dead-live check proves the tester works before and after the test, so a 'dead' reading can be trusted."}]}